Saturday, 25 June 2016

Observations on Yellow-wattled lapwing Nesting

Yellow-wattled lapwings, in general,seem to prefer a drier habitat compared to their cousins, the Red-wattled lapwings. They are plovers like their cousins. The reason for their yellow wattles is unclear.

I had the opportunity to study closely the nesting behaviour of Yellow-wattled lapwings. They tend to nest on the open ground. the nest is just a scrape on the ground. I had the opportunity to study five active nests from an unobstructive distance away. They lay 3-4 eggs in a clutch. (In birds of Kerala, Dr Salim Ali mentions that the nest contains invariably 4 eggs but I could see two nests with just 3 eggs. I visited again a day after and three days after to see if the clutch would contain another egg. No, there wasn't any new egg).

Spacing of the nests seem to be highly variable. On two occasions, I have seen them nesting barely 25 ft away from each other. It does seem that both the parents partake in the nesting duty. The chicks are born nidifugus (ie., they are able to see, walk and find their own food on birth). However, it seems that the parent broods on the chick for sometime after its birth.



I once walked close to a yellow-wattled lapwing which appeared to be brooding. The parent, when approached too closely, walked away, revealing two very small chicks. The Yellow-wattled lapwing uttered a single note call hearing which the chicks remained immobile in their positions. Since the chicks are very cryptically plumaged, It is very difficult to spot them in an open ground. They seem to perfectly blend with their surroundings.

When I tried to approach the chicks, the parents became very agitated and started calling frantically and flew towards me menacingly. They only became calm after they saw me leave. I could not witness the broken wing display of Yellow-wattled lapwings.(For a detailed discussion of Broken-wing and other distraction displays please visit https://en.wikipedia.org/wiki/Distraction_display) Again, I could see no sign of the egg shells. The parents had either disposed of the egg shells or had consumed them to supplement calcium in their diets. This raises an important question: If the chicks are born Niudifugous, and the parents and chicks start looking for insects away from the nests, is there a need for nest concealment? do they reuse the same nesting sites?

I must mention here that the response by Yellow-wattled lapwings when their nests or chicks are approached were many and varied. Once when I approached a nest, the brooding lapwing simply moved some distance away and sat down in different place like it was brooding in that location. (See picture below). The practice resembled 'false brooding'. There were many occasions where the bird simply walked away while keeping a watchful eye over the nest from a safe distance without crouching down.

On one occasion, a lapwing with chicks, collected both the chicks under its wing and crouched low to the ground.

In another occasion, when I walked upto a parent with four newly chicks (Undoubtedly from one of the nests I have been observing), the parent uttered a single note call. hearing this call, all the four chicks lay flat on the ground and were immobile.


Their nesting practices raises many questions. How are they able to protect their nests against predators like crows, kites, buzzards and feral dogs? how do they make sure that nests are not accidentally trampled by grazing animals?

I could observe that the Yellow-wattled lapwings do not abandon their nests even after their nests with eggs or chicks have been discovered. I also observed that they are not very aggressive when the nest contains only eggs. Their behaviour changes only when chicks are present.

The effectiveness of their plumage can be appreciated in summers or post summers when the grasses dry out and Yellow-wattled lapwings begin to blend well with their surroundings.

I could also see Yellow-wattled lapwings are affected by mites the same as Pipits are affected by Mites.

I visited the breeding site on 10/07/16 when it was raining. I wanted to observe f the parent was brooding on the eggs even during the rains and I could observe the dedicated parents on the job unmindful of the rain. I even observed several lapwings collecting insects in the rain. Rain seems to be only a minor inconvenience in their scheme of things.

One of the nests I have been observing from 18/06 had finally hatched on 14/07. So The incubation period of the eggs should be greater than 26 days. (Greater than 26 because I don't know when the eggs were first laid) It appears that all the eggs hatched simultaneously.(I visited the site of 12/07 and still saw the eggs being brooded by the parent) . It was fascinating to me that all eggs hatched simultaneously even if they were laid a few days apart. I am sure that bird has been brooding on the eggs since they were first laid, then how is this feat of simultaneous hatching achieved?


Questions that remained with me:
1) How long are the eggs incubated?
2) What is the breeding success rate?
3) How long are the chicks dependant on their parent?
4) Do all the eggs hatch simultaneously?
5) Do Siblings from previous brood assist it brooding later clutches?
6) How many broods do a couple raise in a year?
Some of these questions can be answered only if the birds are tagged or colour coded.

Friday, 24 June 2016

Some observations on the Black-shouldered kite

For birders living in the countryside, Black-shouldered kites are a fairly common sight. Often, they are seen roosting on electric lines or telephone lines. They have come so accustomed to roosting on these lines that it sometimes becomes frustrating for photographers to take photographs of them in a 'natural perch'. (This is mandatory for qualifying for photography contests)



They can often be mistaken for crows because of their apparent small size. I have seen Black shouldered kites roosting alongside crows and mynas. These birds don't seem bothered by each others presence. It also quite common to see them being mobbed by crows. We can only assume what transpired between them. Black-shouldered kite probably tried to steal eggs or chicks from a crows nest.

I once observed three Black-shouldered kites, while being mobbed by crows, were also engaged in some sort of a ritual. In mid flight, one of the Black-shouldered kites would flip over and present the talons to the other bird. The other black-shouldered kite would catch hold of the talons and would cart-wheel in the sky for some distance before breaking away and repeating this process. I had seen this kind of behaviour in sea eagles in "The Life of Birds" documentary by David Attenbrough. Sea eagles engage in such cartwheeling while fighting for territory.

I tried to look up several sources to find out if this behaviour was documented in Black-shouldered kites. However, there was no mention of this. In the book "Birds of prey" by Rishad Naoroji, there was a mention of this behaviour. It is apparently a courtship ritual that these birds perform. It is mentioned that the usually the female usually flips over and presents its talons to the male. I was unable to ascertain this as the sexes are indistinguishable in the field.

Another thing I have observed with Black-shouldered kites is their tail flicking behaviour. while roosting, they are sometimes observed to flick their tails up and down in a unique fashion. I don't know the reason for this behaviour. They are perhaps signalling. I however could not sight another black-shouldered kite in the proximity.

When they are roosting and they are about to take off, they almost always defecate. Infact, I believe most raptors defecate before take off. I have seen White-eyed buzzards do this.

I also have seen Black-shouldered kites being active very early in the morning to very late in the evening. (on June 24/06/16, I actually Black-shouldered kites hunting for prey at 7:00 PM in the evening. However, the date being very close to the summer solstice, enough light was available)

One observation shared by an ardent birder was that the presence of Black-shouldered kites in a location, is an indicator for habitat destruction. I don't know the basis of this belief or if this belief is true. It needs validation.

Saturday, 18 April 2015

Sighting a rare Melanistic cattle egret in my village

I was doing a routine evening walk inspection in my coconut plantation located in Puliampatti on 15/04/2015 (near Palladam, Tamilnadu). I noticed a rather strange looking Cattle egret (Bubulcus ibis). At first glance, it appeared as I it just walked out of a ditch as it was very dirty in appearance. Cattle egrets have a yellow beak, Dark legs and have a stark white plumage. In their breeding season, they develop a yellow shade in the feathers of the head, neck and rump area. However, this bird was different as it appeared mostly black. Though it puzzled me at that time, I continued my walk assuming that it must somehow got dirty. Later that evening, we had a heavy downpour. When I got up the following morning, I decided to visit my farm with my camera as I know that the birding is usually good the morning after a heavy downpour. I happened to come across the egret I saw the previous day. I immediately knew that there was something strange about this bird as it looked exactly in the same manner as I saw it yesterday. Even if it somehow gotten dirty, the dirt must have gotten washed off yesterday. The other oddity I noticed about this bird was that it was foraging in isolation.  Most cattle egrets forage in the company of other cattle egrets. I suspected that it could be a melanistic Cattle egret. I immediately took a few record shots of the bird with my camera. I immediately shared the photo with Coimbatore nature society, which I am a part of. Some senior members confirmed my suspicion and they suggested that I should also consult with other experts. I posted the image in several groups in Facebook and also sent an email to SACON to verify my suspicions. Dr Mahindran Myilswamy of SACON confirmed that it was indeed a melanistic cattle egret. Aberrant colourations, such as melanism, leucism and albinism, have been well studied but very few records of birds exist. Melanism is a condition where there is excess of melanin pigmentation. Melanism has been well documented in animals but extremely rare in birds. There are very few records of melanistic cattle egrets in the world.  This news has piqued the excitement and interest of Birdwatchers and ornithologists across the country.

Wednesday, 23 July 2014

Vultures: What ails them?


There about five species of vultures in India. Three of which are said to be critically endangered. These are the oriental white-backed vulture (Gyps bengalensis), long-billed vulture (Gyps indicus) and the slender-billed vulture (Gyps tenuirostris). Two other species - the red-headed vulture (Sarcogyps calvushave) and the Egyptian vulture (Neophron percnopterus). The vulture population has declined by close to 99% in the last 20 years.

Why vultures are becoming extinct?


1) Diclofelnac

The main reason for the sudden and dramatic decline in vulture population is due to use of vertinary drug called as Dicloflenac. This is used in cattle as a pain reliever. Diclofenac is particularly lethal to vultures as it gets into vultures body when it consumes the carcasses of dead cattle which has been injected with diclofenac within 72 hours of its death. The Vultures stomachs are unable to breakdown this drug and it causes kidney failures and ultimately their death. In some cases, it affects their ability to reproduce. Since March 2005, the drug has been banned for vertinary use in India. However, it continues to be used as verterians use a human form of this drug on cattle. Another Non-steroidal anti inflammatory drug (NSAID), meloxicam, has been found to be harmless to vultures and should prove to be an acceptable substitute for diclofenac. When meloxicam production is increased, it is hoped that it will be as cheap as diclofenac. Another NSAID, Ketoprofen & aceclofenac has been proved equally dangerous for vultures but awareness regarding this hasn't yet increased.

2) Poisoning:

 In some cases, farmers wanting to protect their cattle from attacks from wild animals like tigers, lions, cheetahs and leopards, poison meat. The cats which feed on them die and the vultures which feed on the poisoned meat or the cat which died because of consuming poisoned meat also die as a result.

3) Starvation:

 Another reason for decline in Vulture population near villages and towns is Starvation. Villagers previously used to discard dead cattle at the edges of their villages are now selling the dead cattle to butchers for meat. Vultures which previously depended on dead meat for their subsistence are finding it increasingly hard to find food.

4) Wind turbines:


Wind turbines, heralded as an alternative source of power, has a dangerous side to it. It has been observed by ornithologists that Wind turbines can decapitate and slice vultures into two.

Other causes:
  • Electrocution
  • Malaria
  • pesticides
  • lack of nesting trees
  • Pardhi community in Maharashtra (called as Wagris in Gujarat) eats vultures. They catch whole flocks and devour them.

Why vultures are important?

1) Decomposing of dead bodies in the wild take anywhere from 3 to 4 times longer in the absence of vultures
2) Decline of vultures contributes to raise of diseases like anthrax, rabies as feral dogs and crows take place of vultures when vultures drastically decline.


Further reading:


http://en.wikipedia.org/wiki/Indian_vulture_crisis

http://www.ted.com/talks/munir_virani_why_i_love_vultures.html

http://cameronmccormick.blogspot.in/2009/07/on-importance-of-vultures.html

http://indiasendangered.com/six-reasons-why-vultures-may-be-dying-in-india/

http://www.bbc.com/news/science-environment-25963100

http://www.ncbi.nlm.nih.gov/pubmed/20007163

http://timesofindia.indiatimes.com/home/environment/flora-fauna/Vulture-numbers-rise-up-for-first-time-in-20-years-study-shows/articleshow/17187819.cms

http://www.nature.com/news/the-trouble-with-turbines-an-ill-wind-1.10849

http://news.bbc.co.uk/2/hi/science/nature/3437583.stm

Tuesday, 22 July 2014

BNHS- Basic course in ornithology

Dear Friends,
            I haven't been posting as frequently as I would have liked. Well, I have been kept busy because of an online course that I have taken with BNHS (Bombay Natural History Society) entitled "Basic course in Ornithology". I have to say that the course has been quite demanding and has been a great learning opportunity for me. The entire course is managed online through a website called as lore.com and it is a year long in duration. Every month Chapters are posted online which can be read at our pace. There are also a variety of online and offline activities including a year long project work which augments the online course. However, for me, the star attraction has been the five proposed field camps located in the far flung corners of our country like point calimere, Thattekad, Bharatpur & Bigwan which are also the most important birding areas of the country. I suggest this course to anyone with a n interests in birds and also in travel. However, be forewarned, this course can end up costing quite a bit of money with all the travel, staying, accommodation and stuff. I have made an inaugural camp report for the project which I would like to share here for your information and use.


Introduction:

In This report, I have tried to summarise the various activities carried out during the introduction camp. The Introduction camp was held at Conservation education Center of BNHS on 28th & 29th of July 2014. I have had several key learnings in all the sessions conducted during the course of the camp and I also got to know a lot of people in the interactions during the activities and also during the breaks. I have also tried to list the key learnings of each activity.

Individual introductions:


Our first event in the introduction camp was the individual introductions we had. When I kept hearing from individual participants about what they do and how they took to birding, I was fascinated and felt quite happy in knowing that I was part of a diverse and well informed group. I look forward to our interactions and knowledge sharing opportunities.

Nature trail-1: with Saurabh


We were divided into two groups. One would be headed by experienced birder, Mr Saurabh and the other was to be headed by similarly experienced Mr. Adesh. I was to go with Mr. Saurabh. Though conventional wisdom tells us that the best time for birding is early in the morning, Saurabh made up for the lack of birds with his knowledge which he was quite happy to share with at various points on our trail (which was ominously called the leopard trail!) As we headed out into the forest area adjoining the CEC, we were told what to look out for when we were out birding. We were told how to identify various songs. We were also asked to come up with mnemonics for the bird calls we hear to help us identify the birds. He suggested some resources that we could use to come up mnemonics. We sighted / heard the following birds during the course of the trail:

1.    House Crow

2.    Jungle crow

3.    Tailor bird

4.    Common Iora

5.    Oriental dwarf king fisher

6.    Oriental magpie Robin

7.    Puff throated babbler

We also learned about the “edge effect” ie., we tend to find more birds along the roads by the sides of jungles than deep inside the jungle because birds which want to move from one part of the forest to the other tend to perch on the trees on the edge before crossing over to the other side of the road.

Introduction to birds: Presentation by Mr. Adesh Shivkar


This presentation was a basically a quick recap of the introduction chapter which was posted on lore.com.  However, it was not without new information. We learnt that Wilson’s storm petrel is the most numerous birds in the world and is sometimes referred to as a mutton bird because it is hunted by hungry sailors for meat. He also told us how the brown headed barbet and the copper smith barbet are expert ventriloquists as they can both throw their voices. He told us how, the once most numerous birds in the world, the passenger pigeons have now become extinct.

Presentation on Bird calls: by Ms. Ketki Marthak


Ms. Ketki had a short and fun presentation on bird calls which left me wanting more. We were first told how different birds make their sound and we also understood the difference between a call and a song. We also learned that by using some mneumonics, we can identify birds by their calls very soon. Some of the mnemonics that she told us is represented below:

S.No
Bird
Call Mneumonic
1
Indian cuckoo
One more bottle
2
Eurasian cuckoo
Cuck-coo
3
Hawk cuckoo
Brain Fever
4
Koel
Cou…  Cou…
5
Ashy Prinia
Jimmy, Jimmy,
6
Puff Throated babbler
I will beat you
7
Lapwing
Did he do it?
8
Grey frankolin
Patela, patella, Kapil dev, Kapil dev
9
Drongo cuckoo
1,2,3,4,5 (Rising crescendo)

 

We also came to know about the interesting phenomenon of mimicry of birds which makes it difficult to identify birds. Towards the end of the presentation, Ms. Ketki also shared a couple of Videos on the mimicry of superb lyre bird and also the American grey catbird. It was fascinating to watch the mimicry of the birds.

Nature trail-2: with Parvish Padya


We sighted the following birds:

1.    House Crow

2.    Jungle crow

3.    Tailor bird

4.    Common Iora

5.    Oriental dwarf king fisher

6.    Oriental magpie Robin

7.    Puff throated babbler

8.    Crimson sun bird

9.    Pale billed flower pecker

10.  Brown headed barbet

11.  Red vented bulbul

12.  Red whiskered bulbul

13.  Grey horn bill

14.  Coppersmith barbet

15.  Southern coucal

The highlight of the nature trial was perhaps our sighting of a bold brown headed barbet which was sitting conspicuously in an exposed branch. The brown headed barbet is an indicator species for a good canopy and we were happy to sight the bird in CEC campus. We came to know about the controversy surrounding the naming of the birds and the changes in recent years.

Presentation on Bird adaptation by Parvish Pandya:

After our late afternoon bird watching trip, we had a presentation by Mr Parvish Pandya. He told us about the various types of adaptations that we can find birds that have developed in an evolutionary timescale to respond to changing environments.

Bird quiz:


Bird quiz was a fun way to learn. The questions were drawn from the first chapter, from the presentations that we had earlier in the day and also from current affairs. I happened to be on the team that won the quiz (Trogan) but the quiz sure was a nice way to have recap on the introduction lesson. Especially fun was the dumb charades session towards the end of the quiz program.

Night walk inside CEC campus:


We had a night walk inside the conservation for the education centre campus. We were hoping to spot some nocturnal birds but we had no such luck. The neighbourhood woodland was alive with the sound of crickets. We understood that the daytime sounds were caused by cicadas and the night time sounds by crickets. We chanced upon a group of spotted deers grazing in the tickets nearby. We also sighted a group of bonnet macaques sleeping in a tree. The highlight however was sighting the chameleon fast asleep clinging on to a climber. Overall, the night trial helped us get a sense of the forest at the night time.

Nature Trail-3: with Adesh Shivkar


We started on the trail early in the morning on 29/06/14 (Sunday) around seven AM. We learnt that Mornings are generally the best times to sight birds as they would have woken up hungry and thirsty and would be out looking for food and water. We sighted the crimson sunbird, spotted dove, House crow, Jungle crow, Common myna, white browed bulbul, Red-vented bulbul, Red-whiskered bulbul, and Grey hornbills. We kept hearing the Puff throated babbler, Ashy Prinia, Tailor bird, fan tail flycatcher, common iora but we didn’t sight any. We were now developing a good sense of what we were hearing in the wild because of the repetitions of our activities in the previous day. Our Nature trail concluded at Salim Ali point, which was the highest point in CEC campus. We were frustrated by the number of jungle crows and house crows. These loud and rowdy birds were perhaps driving away the other birds which we could have otherwise sighted.

Introduction on Lore and grading system:


This session was conducted by Ms Priti Chogale, our course coordinator.  I was fascinated to learn that we were only the second batch to do this course in an online mode. I learnt how the lore.com website would be used throughout the duration of course and also the activities planned throughout the year. As an outstation participant, it would be difficult for me to participate in the field trips organised by CEC close to Mumbai. However, Thattekad and Point calimere camps seem to be close by and definitely doable.  I also look forward to the Bharatpur sanctuary visit. I learnt about the grading system of the program. While it seemed definitely doable. It does demand quite a bit of planning and organising. It does look like a busy year.

Bird survey: with Priti


After the short presentation by Mr. Kevin on the Point and Line transact survey methods by Mr Kevin , we were out on the field once again. We were given a datasheet which we had to fill based on our observations in the field at four different points in the trail. We had taken the stream trial along with the course coordinator Ms. Priti Chogole. It was definitely fruitful birding trip where were forced to record our observations on the sheet at our observations and ignore the others we might encounter along the way. We did find the scientific approach to be quite helpful in objectively recording our observations. In all we managed to locate 42 individual birds from ten species and eight families. We also had a few unidentified individuals. The highlight of this trail was perhaps our sighting of the white-rumped shama which was practising its song when it was being mobbed by two jungle crows.

Group Presentation:


Group presentation was again a fun time for us where we made a chart of all the observation sin the field and we had to present the same in from of an audience. It was a nice way to summarize and share our observations in a succinct manner.

Feedback session:


            We were asked to give a feedback on the different speakers and the introduction camp. Overall, I was happy about the camp but I felt that the camp premises can be maintained well. The Toilets and bathrooms were smelly and dirty. The paint was peeling off from several walls. The sleeping arrangements left a lot to be desired. The management can at least make arrangements for decent bedding and pillows. The lunch and dinner offered on both days were fine. I felt that the breakfast offered can include a few more items.

Conclusion:


            This camp has helped me understand how to keep my eyes and ears open when I go out for a bird watching trip. I also could see several new birds which I haven’t seen or heard before. I am happy that I am a part of a diverse group of people from several walks of life which would help me in learning from my peers as well.

 

 

Monday, 21 July 2014

How Wolves Change Rivers

Below is an amazing documentary on how wolves can be a keystone species. The Video shows how they can have a profound impact on the ecological diversity of the area and have the power to change the geography of the area.




Tuesday, 18 March 2014

How fast do birds fly?

Bird flight has been studied for some time now using Doppler guns and scientists have tried to estimate how fasts do birds fly and have tried to see if it has any relation to bird size.
based on research, scientists have found out the following:
  1. In general, there is little correlation between the size of bird and the flight speed it is capable of. Humming birds and geese both are capable of the same maximum flight speeds.
  2. Most birds fly in the range of 30-50 Km /hr.
  3. There is usually a huge difference between how fast can fly and the speed at which they normally fly.
  4. There is a huge difference between normal flight & when pursued by raptors.
  5. It also appears that birds fly faster when assisted by wind.
  6. The fastest migratory bird: The great snipe which covers 6,760 km non-stop journey at 97 Km/hr
  7. The fastest level flying bird: The spine tailed swift at 171 Km/hr
  8. The fastest gravity assisted flight: The peregrine falcon which can dive at speeds close to 320 Km/hr
By the way, the Guinness Book of World Records started as a result of an argument about the fastest game bird in Europe. In 1951, Sir Hugh Beaver, the managing director of Guinness Breweries, was in south-eastern Ireland with a group of friends, enjoying a day’s shooting. Failing to shoot a golden plover, Sir Hugh maintained that this must be the world’s fastest flying game bird. His companions disagreed. Sir Hugh used his own fortune to research the question, and that’s how the Guinness Book of World records got started.



Reference:
  1. http://www.stanford.edu/group/stanfordbirds/text/essays/How_Fast.html
  2. http://www.thetravelalmanac.com/lists/birds-speed.htm
  3. http://earthsky.org/earth/fastest-bird

The great snipe


Spine-tailed swift



Peregrine falcon