Showing posts with label summer. Show all posts
Showing posts with label summer. Show all posts

Monday, May 3, 2010

The mad courtship of the Cotton Pygymy-goose

The Cotton Pygmy-goose is India's smallest Anatid (a group of birds comprising ducks and geese). The males are incredibly pretty, and the females are drab - characteristic of Anatids. One cloudy early morning, I chanced upon several small flocks spread out on a large lake. They appeared to be engaged in courtship. In this entry, I share my observation and attempts to photograph their mad yet delightful behaviour.

Each female - apparently unpaired as yet - was chased by 2-4 loudly honking males across the lake. Females appeared to be attempting to escape the loud and boisterous masculine efforts. But they kept up with her as she weaved around the lake. Above, the female is being pursued by four gorgeous males.

The female landed several times, perhaps tired, perhaps attempting to dissuade the males from further pursuit.

The female attempted also to take off again several times, and her troubles only grew as a result. All the males, honking their protest, gave chase.

They tried to ward her off, and females seldom managed to fly free again after the first landing.

The nearest male then physically dunked her back onto the water! Above, the female is on the extreme left hidden by the male who is pecking at her to force her to land on the water again.

The female then was in real danger of being drowned as the enthusiastic males rushed at her, frequently landing on top of her. The female was under water many times, as the males splashed around vying for her to choose them. The water churned madly as the males appeared to be nearly killing the female they were fighting to get.

Then suddenly and quite mysteriously, a partner had been chosen. He swam around her in slow circles with head bent forwards in a graceful bow, and the other males swam away honking their obvious disapproval.

Was this going to be her partner for the year? What was better about him compared to the other males who appeared as robust, noisy and interested? Another bird mystery that awaits study.

(All photographs taken on 02 May 2010 at Samaspur Bird Sanctuary, Rae Bareli.)

Friday, April 30, 2010

De clay is good

Clay is sticky, holds water for long periods, and accumulates in wetlands each year. Clay also breaks up into dry blocks in the summer making it easy to collect!

Wetlands in the Gangetic flood plains have a lot of silt and clay in the water that are continually churning due to water flows and human activity. The finer silt settles down, and on top of it the coarser clay is layered. This can "kill" the wetlands - making them easier to convert to croplands, filling up the depression, and holding up moisture that would otherwise have likely percolated to the ground water store.

The ancient practice of removing clay during summer in Uttar Pradesh by the people keeps wetlands from dying. Block by pain-staking block of dried clay is broken off, and ferried by hand to the road where a bicycle awaits.


Entire villages stockpile the useful clay. They are used to repair damaged walls of mud-huts, fill up leaks or as a natural cement for brick-houses, to make clay-bricks, or to make dykes of flooded paddy fields. Villages therefore benefit from maintaining village ponds, and collecting clay is often a community activity. The following year(s), the process of soil accumulation begins all over again in a now-deepened wetland. Unwittingly, natural habitat for a variety of birds and flora is maintained.

Newer "technology" has allowed many people to build houses that do not need annual maintenance. In such areas, village ponds like the one above likely require the clay to be removed, but is not paid attention to. The landscape ends up losing precious wetland habitat, and the people lose opportunities to work together.

(Thanks to Shyamal for a lesson in Soil 101. All photographs taken on 30 Apr 2010 at Rae Bareli.)


Post-script: Illegal usurping of community wetlands can lead to unfortunate disputes - for a recent story on a shoot-out due to clay removal, read this.

Sunday, April 25, 2010

Mud puddlers

Wet mud and butterflies - the two do go together.

Two-spot Grass Yellows bustle on wet mud

Male butterflies drink up moisture retaining only nutrients that are dissolved, and quickly get rid of the water that would otherwise weigh them down.

Common Mormons (background) and Common Gulls (foreground) puddle together

The nutrients are passed on to females during mating, and improve the chances of the eggs surviving.


Common Lime butterfly gets its share of nutrients

Nutrients are also obtained from over-ripe fruit, sap, dung, and rarely, even blood.

(All photographs were taken on 18 Apr 2010 at Katerniaghat Wildlife Sanctuary, Uttar Pradesh.)

Sunday, September 27, 2009

Of Owlets and Owlings

The young of an owl is an owling, while the owlets are a group of small owls. Uttar Pradesh's non-forested areas still retain several species of owls and owlets who appear to breed quite nicely as evidenced by the regular sightings of owlings. Here are two species that I was able to photograph.


Jungle Owlets may not be very appropriately named since they occur in a wide variety of habitats, many outside what may be considered a "jungle". This fellow was calling away on a Eucalyptus tree in the middle of a wheat-and-vegetable landscape.


The Spotted Owlet is perhaps India's most common and widespread owlet. The adult (top) is coming to terms with the early-morning lighting in the canopy of a Neem tree - the pupils of each eye are dilated differently. The owling of the Spotted Owlet (above) appears obviously teenager-ish, and is ready to begin hunting on its own at a few months of age. This particular one, however, was still depending on its parents to do the work.


(Photographs information: Jung
le Owlet: 09 Dec 1998, in Rae Bareli district; Spotted Owlet: adult - 24 Jul 2009, in Sultanpur district, owling - 04 May 2009, Sultanpur district.)

Tuesday, August 18, 2009

Waterbird foods: Black-necked Stork

Despite their large size and declining population, Black-necked Storks have received relatively little scientific attention. The most prominent study is that carried out by Gopinathan Maheswaran in the managed lakes in Dudwa Tiger Reserve in northern Uttar Pradesh. The storks there were seen to eat fish as their major food.

The unmanaged wet
lands amid agricultural fields in western Uttar Pradesh have the largest known population of this species. Here, observations show that fish is not likely their major food - frogs (and reptiles) are! The photographs above show (from top) newly fledged juveniles have already learnt to catch frogs, snails sometimes figure in the diet of juveniles, and large bull frogs make for a great meal and are literally beaten to death by adults before they are swallowed.

(Photo information: top: 21 Jan 2009, Etawah district; midd
le: 7 Apr 2009, Etawah district; bottom: 12 Apr 2009, Etawah district. I put together all the observations I had made over the years of food items that Black-necked Storks ate, and now have a note in the journal Forktail in case you are really interested.)

Monday, July 13, 2009

Chambal Diary: 6. River Lapwing

Previously aptly named the "Spur-winged Plover", the River Lapwing is a striking species with real spurs on its wings (see above) used during duels with fellow River Lapwings. These distinct more-or-less black-and-white birds share the riverside at Chambal with two other resident lapwing species - the Red- and Yellow-wattled Lapwings.


River Lapwings, as their name suggests, are found primarily along rivers. They find their food - insects, and other creepy-crawlies - in the sand and on vegetation along the rivers.


This species is adapted very well to river systems. They lay and incubate their eggs in a shallow scoop in the sand on river-banks and islands, much like their neighbours the terns and skimmers. Above, a lapwing incubates eggs beside a sleeping Comb Duck.


They are watchful parents. Here, one adult watches cautiously after ensuring that its chicks are well hidden among the scattered rocks on the island.


3-4 eggs are laid in the simple scoop - above a lapwing adjusts the eggs in the nest. Eggs are cryptically coloured: if the incubating bird were to walk away, it is exceedingly difficult to spot them on the sand.

(A
ll photos taken in the National Chambal Sanctuary, Uttar Pradesh on 9 Apr 2009.)


Sunday, July 5, 2009

Chambal diary: 5. Little Tern

The Little Tern is the smallest of the resident terns in the Chambal - tiny compared to the much larger skimmers and river terns. Instead of a neat full black cap, they have a white forehead, and a streak of black serving as eye-patches. Their legs are also much less colourful compared to their fellow terns and skimmers.

In this entry, I describe the nesting behaviour of this species of terns. Most of this behaviour is common with the other terns and the skimmer. This blog entry gives a snapshot into the part-ritual and part-politics that is an inherent part of the terns' lives.

The first thing to do for the males is to find a female who does not chase them away. A gift of a fish is mandatory to beginning the courtship ritual. Birds paired initially like this spend a long time - sometimes hours - standing in the position showed above calling to each other. The male ensures that the female does not snatch the fish away, but keeps it as tantalising bait until the female is ready to mate.

Competition for mates is common! Here, a male with a much larger fish tries to break up the courtship, but the male and the female bird that have bonded scare away the interloper. Clearly, size of the bait-fish is not everything!

After much posturing and courtship, the female finally allows the male to mate with her, and the male relinquishes the fish.

Mating itself lasts a very short time.

It appears to be the males' job to choose the spot where the female will lay their eggs. It is also his job to create the depression in the sand that will serve as the nest. The bird uses its belly, wriggles around in a circle until a depression is formed. The female watches over the whole exercise carefully.

Nests are located some distance from each other, and pairs are fiercely protective. There is a lot of jousting for space - both on the sand and in the air. Observing birds that nest in riverine islands is very rewarding. There is seldom a boring moment. Obsevers need to be very careful not to disturb the birds. It is less important to get full-frame photographs, for example, than it is to ensure that the birds are not disturbed.

Islands in the Chambal are exceedingly important for populations of a range of species, and here is to wishing that it continues to be do!


(All photos were taken on Apr 10, 2009 at the National Chambal Sanctuary, Etawah.)

Thursday, July 2, 2009

Chambal diary: 4. Indian River Tern

Gracefully proportioned with long wings, a fish-shaped tail, bright legs and yellow bill, the Indian River Tern is a sight for sore eyes.

It resembles the Black-bellied Tern, but is larger with a conspicuous white belly that allows easy differentiation of the two species. The habits of the River Tern are very similar to that of the other terns in the Chambal and the Indian Skimmer - it is also evolved for a life in clean rivers with plenty of fish and islands to breed on.

Human use of the river does not appear to affect the tern population in the Chambal suggesting that the islands are undisturbed during the breeding season, and that the fish populations are adequate.

(P
hotos were taken on Jan 18 and Apr 09, 2009 at the National Chambal Sanctuary, Etawah.)

Chambal diary: 3. Indian Skimmer

Skimmers are unique in having a longer lower mandible relative to the upper - a bird with a permanent pout if you will. They use this amazing "device" to literally skim the water surface (photo below) snapping the beak shut when they come into contact with a fish. The Indian Skimmer is therefore very easy to identify being the only skimmer species in India. They, like the Gharial, are exclusive fish-eaters.


One of the largest known populations of the Indian Skimmer is located in the National Chambal Sanctuary. They, like the other terns, use the islands to nest in. This charismatic, attractive species is a superb indicator of undisturbed rivers. Here are some Skimmer photos showcasing its habits.

Skimmers, fortunately, never have to go far to bathe!

Pair-bonding prior to mating and egg-laying is very important. Above, a male (larger bird on the left) gives the smaller female a gift of a fish before they set up their family for the year.

Both parents take turns to incubate eggs, and feed chicks. The two pictures above show a nest-change - one bird settles in on the eggs after feeding, and the other takes a break. The bird coming in wets its breast and belly feathers before restarting incubation duties to ensure that the summer heat does not bake the eggs. Small Pratincoles also incubate eggs of their own beside the skimmer's nest.

In the absence of directed persecution, Indian Skimmers appear to be able to persist in the presence of some human disturbance. The National Chambal Sanctuary is bounded by villages along its entire length whose people use the river in various ways. So far, this use does not seem to be affecting the skimmer population.

The Indian Skimmer and The Gharial - two species entirely reliant on unpolluted rivers with good fish populations and islands in the summer months to breed on.

(All photos were taken in the National Chambal Sanctuary, Etawah on Apr 9 and 10, 2009.)

Chambal diary: 2. Black-bellied Tern


Terns and Gulls are closely related and are usually associated with coastal areas. Indian inland rivers have breeding populations of a few species of terns that are specialized to reside and live off these rivers. The Black-bellied Tern is one such species. Good numbers of this species are found in the Chambal suggesting that conditions for breeding and feeding (mostly fish!) are currently good.

These birds breed in early summer on islands formed due to the reduction of the water levels. Dams, increased agriculture, and excessive accumulation of sand in the rivers can limit the formation of islands leading to reduction of breeding activity of birds like the Black-belled Terns. But enough lecturing - here are a couple more photos of this beautiful bird.


Two Black-bellied Terns mate on an island. Eggs will be laid on a small scrape on the sand, and both parents take turns to incubate eggs and to raise the chicks.

Black-bellied Terns are aggressive parents. Here one bird attacks a much larger egret - successfully - which strayed a little too close to the nest.

(Photos were taken on Apr 9, 2009 at the National Chambal Sanctuary, Etawah.)

Tuesday, June 16, 2009

The sun, the moon, and the Sarus


Etah is one of the worst towns in Uttar Pradesh, but the district has excellent populations of Sarus Cranes and many other waterbirds. Roadside marshes, village ponds, perennial wetlands, and agriculture fields mesh and merge here to provide a variety of habitats.

I was fortunate to photograph Sarus Cranes in Etah with both the sunrise, and the setting moon.
The former was easily possible since most areas I visited for the study in Etah had Sarus Cranes! The latter was a particularly happy and completely accidental occurence. Two Sarus Cranes and some storks were beginning to forage in a roadside marsh just as the moon was setting some time before the sun rose. We happened to pass by enroute to work, and here you are.

(Photo detai
ls: top: Apr 2, 2009; bottom: Jan 12, 2009.)

Tuesday, June 2, 2009

Everybody loves a good sun





The Gangetic flood plains can get pretty cold in the winter, and in the early mornings of any season. Sunning is therefore a commonly noticed activity in the myriad life forms here - nothing quite like some temperature to put life back into the frozen bones. Here are a few life-forms doing their thing in the sun.

From top: A Baron butterfly warms up atop a garden plant; the Kachuga turtle suns atop a Gharial that is a fish-eater (something that the turtle obviously knows); a Green Bee-eater and a Greater Coucal open up their feathers to let the sun warm up the darker feathers on their backs.

(Photograph information: Baron - Dec 7, 2008, Rae Bareli district; Turtle-and-Gharial - Jan 18, 2009, National Chambal Sanctuary, Etawah district; Green Bee-eater - Apr 7, 2009, Etawah district; Coucal - Dec 25, 2008, Jaunpur district)