Archive for August, 2006

Practitioners of decoy

Recent nesting site discovery of the Blue-Winged Pitta (Pitta Moluccensis) in Ulu Paip, Kedah, puts it to be the third known location of breeding pittas in Malaysia – the other being, Langkawi Island and Taman Negara.

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A 40 year old, relative to the fruit plantation owner remarked those colourful birds have been around since her childhood days! There had been previous nesting sites in different orchards but the families had in the past dismissed them as mere birds left to breed as nature would have it while their focus were purely on fruit harvests (left).

My first encounter with breeding adults was a beginner lesson taught by the birds. They are fast, alert, intelligent, highly cautious and great practitioners of decoy.

I was soon to discover that pittas loved a game of’ ‘hide and seek’. The game is over if one gets spotted first. That meant the bird would be leading me on, perched and teased only to fly off to another branch. When my approach got too close to be comfortable, the bird would disappear for good leaving the exasperated pursuer in despair.

I had to drum up ‘Sun Tzu’s strategy and be prepared if I were to have any opportunity to be closed enough to take some documentary shots, without stressing the Blue-Winged Pittas.

Adorned with camouflaged drapes, the vehicle was sent into hiding and I took to my feet with my new companion, DG Scope and approached stealthily from the rear towards a prospective pitta site.

There was an aura of total quiet as I led the way with my scope. We plodded along the narrow tarmac, running parallel to the orchard of durians while I looked through my 8×42 binoculars for any blue-white flying object.

I felt a pair of eyes was quietly watching me and it was coming….coming from a rambutan fruit tree.

A Greater Racket-Tailed Drongo (Dicrurus paradiseus) decided to fly across the road and perched on the same tree.

It was as though to say, “Hi birder count me in too!”

Suddenly, silence was broken by a loud, continuous squawking of a bird.

“I cannot recognize that bird call.” I said to myself hugging on to my five kilos something DG Scope.

My ears followed the distressed signal chased by my binoculars which finally caught up with an image of a startled blue-winged, red bellied, no tail bird having a ‘stand- off’ with the drongo.

The drongo has blown the bird’s cover. It’s the pitta!

I froze in surprise while the bird continued screeching unceasingly. It was almost like a whole minute before the defeated drongo took to a 100 metre flight deep into the orchard, leaving the screaming Pitta behind who forgot my presence.

As though harassment wasn’t sufficiently satisfied, the pitta suddenly flew out and headed towards the same tree as the drongo. At a distance, I could see the silhouette of a Pitta confronting and scolding the intruder perching on the same branch.

I had to be quick if I am to get this interesting shot. Before any focus on the bird could be had, the Pitta went into a semi-concealed position.

‘Where is the bird now?’ I questioned my scope still trying to look for that bird through my x50 eye piece.

I raised my binoculars to the direction of the scream and saw only a flash of red belly and something brown behind a vertical obstructed branch. I reviewed my position of strategy and decided I would remain hidden and stand behind the tree to watch any change of pitta’s position.

Unfortunately, no full views were to be had for a scope shot as the bird had gone into total concealed position.

The drongo, my missing piece of jig-saw puzzle, finally got the message and flew out of sight. The pitta continued to wallow screams for another one minute or so despite the ‘Black Knight’ having flown. The pitta waited a final half-minute more and finally disappeared.

Well, it is one of those days. You win some, you lose some.

Heading out of the durian orchard rather reluctantly with recharged birding luck, another Blue-winged Pitta (Pitta moluccensis) suddenly flew into view. It flew into a fruit tree branch previously perched by the intruding Greater racket-tailed Drongo.

I was soon to find out why…

I hastily headed for a low canopy tree and took cover. I held my breath and froze in between. Binoculars 8×42 were used at an approximate distance of 35 feet away. These were the following observations.

The pitta did some series of ‘hop and skip’ on the spot while perching under the tree canopy and shunting occasionally in different directions.

The turning of it’s head from right to left with a visual field of 180 degrees and vice versa was done repeatedly while checking consistently for intruders. This behavior appeared to be the main feature of this species in breeding mode.

There were moments when the pitta paused and remained still as if to listen. The elusive Pitta has an acute sense of hearing and indeed the ability to detect intruders a great distance away. The game is over if the intruder is first sighted by the bird that in turn, sends the intruder on a wild goose chase.

However, having said that, the orchard owner did comment the birds were more relaxed when he or regular fruit pickers were around. The sound of motorbikes and passing cars were also not much of an acute deterrent.

The orchard owner has been keeping watch dogs for years since taken ownership of the property. They were no deterrent to these breeding pittas.

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The Blue-winged Pitta hopped fly from one tree branch to another. In taking extra precaution, the bird flew and perched on a concrete post further away. It repeated the usual breeding behavior before a quick dash flight over the fence and disappeared into low undergrowth.

This observation became my very first of a breeding Pitta, unaware it was flying into a nest that was discovered two weeks later. These birds are known to be usually ground nesters (right top).

Parental behavior was observed a week after four chicks hatched. They were observed under camouflaged drapes no less than 30 feet away at half-hour intervals on 3 occasions: morning, afternoon and evening over different days. Only one opportunity attempt was made to take a couple of hand held documentary, no flash shots in the morning when parent flew off after chick feeding (right bottom).

Parenting behavior of pittas is an observation that arouses human compassion. The amount of stress the parents took on, the hard work of sourcing food and feeding four chicks every 10-12 minutes continuously, the team work of sharing, caring for their young and protecting against intruders, call for an immeasurable respect for this avian family.

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As ground nesters, the chicks are more prone to predators like stray animals, reptiles, insects and tendency to succumb to human destructive and predative habits. As such, more surveillance is required of such species specially designed to be natural, excellent practitioners of vigilance and decoy (left top).

Earthworms were the main diet for one week old chicks and abundantly available in the fertile fruit orchards (left middle). It was also observed that initial trips to source earthworms were made further away from the nesting site. Towards the end of fledging period, the exhausted parents, having lost considerable weight, were seen with pickings from near (left bottom).

It was also observed that while a parent was foraging, the other vigilant parent was never far away from the nest and used the fruit tree canopy for sentry duties. Any bird or stranger that approached too close fro comfort, a series of alarm calls, ‘skyeew’ would ring out to ward off intruders and to warn his mate to caution it’s approach.

Birders or photographers finding themselves under such situation would at best concede defeat and back-off, or to leave the place altogether out of the bird’s sight to allow feeding to resume. Otherwise, it was noted the parent with beakful of worms, would fly off in opposite direction to the nesting site to wait it out patiently. It will only to return on a ‘2 step’ approach when all clear.

If not, chicks would be left to starve to death. Such is the sensitivity of this intelligent species in practicing decoy from predation of their nests.

Having witnessed the extreme fragility and harsh environment upon which Blue-winged Pittas choose to breed, in my personal opinion, this is one species that the best and kindest thing for humans when nestlings are found if seen before, is to keep our distance and to leave parental birds to get on with their business of fledging their chicks and let nature takes it’s own course.

It is unfortunate I am not able to provide the first initial week’s documentary account and post fledgling behavior of the adults. I decided to abandon observations under difficult circumstance of an increasing crown that descended upon the orchard.

The birds’ welfare had to come first.

This article is made possible with kind approval from the orchard owner, first initiated when the first pitta’s discovery was made.

SUBMITTED BY DAISY O’NEILL (Avian Writer), PENANG, MALAYSIA

What species of fish does the Little Tern take?

Birdwatchers are happy to just report that such and such a species of birds had been seen fishing. They are generally not interested in what species the birds take. You cannot blame them. After all birders are not biologists. And just catching a glimpse of a bird swooping down on a fish with the help of a pair of binoculars will not allow for the fish to be identified to specific or even generic level.

Not now. A growing band of bird photographers that has been roaming our countryside has brought back excellent images of birds fishing that allow for the fish to be identified.

In this posting we are highlighting the species of fish that the Little Tern (Sterna albifrons) takes from the freshwater reservoir in Kranji. This is only possible through the excellent photography of Chan Yoke Meng. Three species of freshwater fish have been identified through the courtesy of Dr Khoo Hong Woo, formerly with the then Department of Zoology, National University of Singapore. The giant snakehead or toman (Channa micropeltes), one of the largest of the world’s snakeheads, is cultured in our reservoirs and fish ponds as a food fish. The fish, held firmly between the beak of the juvenile shown in the image above is actually a young giant snakehead. These young fish gather in small, tight shoal near their parents and are thus easily predated by the Little Terns.The glass fish (Chanda spp.) are easily identified as the body is translucent. Found in brackish and saline water near the coast, several species are also found in freshwater. They have been known to occur in our reservoirs, probably deliberately introduced. These are a favourite aquarium fish and some are artificially coloured through the injection of dyes.The common tilapia (Oreochromis mossambicus, previously called Tilapia mossambicus) is not native to this region. Introduced as an aquaculture fish, it is popularly served in restaurants. This tilapia is common in our reservoirs. The fish taken by the Little Tern in the picture is a juvenile common tilapia.

Images of Little Tern with giant snakehead (top), glass fish (middle) and tilapia (bottom) by Chan Yoke Meng. Fish identification by Khoo Hong Woo.

Status of the white-eyes in Singapore

Following the posting of the nesting of the Oriental White-eye (Zosterops palpebrosus) by K.C. Tsang recently, Yong Ding Li sent in this report: “…appears that the Oriental White-eyes are fairly well established in Singapore in the form of feral populations and nowadays can be found in many housing estates. Might be wise to be very careful as far as identifying zosterops are concerned as at least four species of white-eyes have occurred in Singapore in a feral state, including Japanese White-eye (Z. japonicus), Chestnut-flanked White-eye (Z. erythropleurus), Mountain White-eye (Z. montanus) and Everett’s White-eye (Z. everetti) and not assume them all to be mere orientals.” Our bird specialist R. Subaraj has this to say on the status of the Oriental White-eye: “The record by KC is a good confirmation of nesting but there have been records of immature birds being attended to by parents. The species has been feral and widespread in certain parts of Singapore, including Holland Woods, Ulu Pandan, Bukit Batok, Toh Tuck, etc. for more than a decade now.

“The native population of the Oriental White-eye died out long before the 1970s - that is just a starting date for modern records. The current population is believed to have started from escape birds (popular cage bird), both accidentally or deliberately freed. They have been around for at least 20 years and the numbers have been increasing without a confirmed observation of the actual nesting. However, the status of this species was accepted in the late 1990s to early 2000s as CI or common introduction, not a mere escapee!

“The current nesting record changed nothing in terms of the species
status. It will still remain a common introduction like Javan Myna (Acridotheres javanicus), House Crow (Corvus splendens), Red-breasted Parakeet (Psittacula alexandri) and White-crested Laughingthrushe (Garrulax leucolophus). They all originated from escapees/releases and will never become Residents (R) which is reserved for true native inhabitants of Singapore and natural colonists from elsewhere who have established themselves here, like the Oriental Pied Hornbills (Anthracoceros albirostris) on Pulau Ubin for example.

“The term feral is preferably reserved for established introduced populations while the occasional sighting of a different species of white-eyes is best described as escapees. With this in mind, only the Japanese White-eyes (as well as Oriental) are fairly common established feral species and I have them on my checklist as Common Introduction (CI). Populations of Japanese are found at sites like Mount Faber, Telok Blangah Hill, Kent Ridge Park and NUS. Other species of white-eyes are mere escapees including Chestnut-flanked, Mountain(?) and Mangrove White-eye (Zosterops chloris).

Thank you Ding Li and Subaraj for your input. Image by YC.

Malaysian Plover: The cryptic chicks

The Malaysian Plovers (Charadrius peronii) nest along the open shore just above the high water mark. The nest is just a scrape on the ground and there is no vegetation to offer any protection. So how does it avoid detection from potential predators? Camouflage is the answer!
The brown, grey, blank and white plumage blends perfectly with the surroundings. The nest is not lined with any insulating plant material as this would make it conspicuous. Similarly the eggs are perfectly camouflaged. There is a long incubation period of up to 30 days during which the parent birds need be vigilant against egg poachers. However, this long period ensures that the chicks hatch with their eyes opened, covered with downy feathers and capable of independent movement within a few hours of hatching.

Such chicks do not need to be constantly brooded in the nest as they are able to maintain their body temperature, though not completely. Thus they initially need to get warm under the parent’s wings. As seen above, the two days old chick is still learning how to walk properly, sometimes toppling over while in a hurry trying to get to the female parent.
Finally able to stand tall and proud.

The account on the nesting behaviour has already been posted.

Input and images by Philip Tang.

Buffy Fish Owl: The big yawn

Connie Khoo of Ipoh, Malaysia came across a juvenile Buffy Fish Owl (Ketupa ketupu) at Kek Lok Tong in Ipoh, Perak recently. She was fascinated by the “yawning” behaviour of the bird and sent in this account to KC Tsang. Through the good office of KC, we got permission for this posting - on condition we include one of Connie’s cats.“This morning I went to check on the juvenile Buffy Fish Owl and saw that it was still on the same tree after fledging between 24-28 June 2006. By now it should be about 10-11 weeks old.

“…the juvenile started to show some ‘action’ by cleaning its face, stretching and flapping its wings and also stretching its long neck. It was yawning a bit, and a bit, and a bit again. That was at 8.30 am. I decided to stay a bit longer and ended up staying about 4 hours. “By 9.15 am I noticed something different in the yawning, because if we yawn, it lasts not more than 10 or maybe 15 seconds and we don’t open our mouth that long. The juvenile bird kept yawning and yawning for long durations and at times held its mouth open for 10-15 seconds, then closed its mouth and yawned again and again. I then realized that it was not yawning but probably strengthen its ‘jaws’. Just like birds flapping its wings to strengthen them as well as the body.

“Finally I made notes of the number of seconds each yawn took and how long the bird held its mouth open. It could hold it open for as long as 20 seconds, showing off its tongue. Can you imagine, the bird was yawning (exercising) from 9.15 am and at the time I left the place at 11.30 am it was still yawning.

Note: Yes, birds do yawn, as do other animals, includingh fish. Now why do they yawn? Maybe to clear their ears as we do during descent on jet flights. Maybe their throat or ears are itchy. Or do they yawn for the same reason we do - to get extra oxygen?

PS from Connie: “Doesn’t Angel look like the owl? The first time I saw the Buffy Fish Owl, I thought it looked like my Angel… Just look at her eyes and forehead, don’t you see the similarity?”

Thank you Connie and KC for making this yawning post possible.

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