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Asian Koel regurgitates pellet

on 12th December 2010

“Whenever a fig tree is fruiting, it never fails to attract feeding birds. Many birds feed on figs including common birds like Asian Glossy Starlings (Aplonis panayensis ) and Pink-Neck Green Pigeons (Treron vernans), to less common birds like hornbills.

“Last month, while on a visit to the heronry, I came across a fig tree that was fruiting in Pasir Ris Park. The tree was in a late stage of fruiting as there were many figs that had fallen onto the ground below. This was the same tree that three Oriental Pied Hornbills (Anthracoceros albirostris) had visited in February 2010. I was looking forward to seeing the hornbills again. However, this time round, they did not appear. The usual suspects that were seen feeding on the figs that day were: Asian Glossy Starlings, Pink-Neck Green Pigeons, Black-Naped Orioles (Oriolus chinensis) and Yellow-Vented Bulbul (Pycnonotus goiavier). The unusual visitors that appeared were Asian Koels (Eudynamys scolopacea) (above left). There were at least eight koels in various parts of the tree. From what I know, Asian Koels are highly defensive of their food source and will normally chase away other koels in the same tree during feeding. As there were plenty of figs in this tree, the abundance could be the reason that there were no squabbles.

“As I was clicking away at one of the female Asian Koels that was taking a break from feeding, its beak opened suddenly (above right), and an object emerged and was dropped in a flash. I realised that it was regugitating a pellet. As it was rather unexpected, the moment was not captured by the camera. Curious, I searched for the pellet that had dropped into the grass below the bird. I found the pellet and placed it beside some figs for comparison (left). The pellet was a few times bigger than the size of a fig and was smoothly contoured. The similarity in colour seemed to suggest that the bulk of the material in the pellet was from the fig. Small seeds could be seen, presumably from the figs.

“I cannot understand why regurgitation of the pellet was carried out. After all, the pellet seemed to contain mainly the pulp of the fig, which must surely be nourishment for it to be consumed in the first place.”

Kwong Wai Chong
Singapore
5th December 2010

If you like this post please tap on the Like button at the left bottom of page. Any views and opinions expressed in this article are solely those of the authors/contributors, and are not endorsed by the Lee Kong Chian Natural History Museum (LKCNHM, NUS) or its affiliated institutions. Readers are encouraged to use their discretion before making any decisions or judgements based on the information presented.

YC Wee

Dr Wee played a significant role as a green advocate in Singapore through his extensive involvement in various organizations and committees: as Secretary and Chairman for the Malayan Nature Society (Singapore Branch), and with the Nature Society (Singapore) as founding President (1978-1995). He has also served in the Nature Reserve Board (1987-1989), Nature Reserves Committee (1990-1996), National Council on the Environment/Singapore Environment Council (1992-1996), Work-Group on Nature Conservation (1992) and Inter-Varsity Council on the Environment (1995-1997). He is Patron of the Singapore Gardening Society and was appointed Honorary Museum Associate of the Lee Kong Chian Natural History Museum (LKCNHM) in 2012. In 2005, Dr Wee started the Bird Ecology Study Group. With more than 6,000 entries, the website has become a valuable resource consulted by students, birdwatchers and researchers locally and internationally. The views and opinions expressed in this article are his own, and do not represent those of LKCNHM, the National University of Singapore or its affiliated institutions.

Other posts by YC Wee

One Response

  1. I have seen the same behavior by koels eating figs in Hong Kong. It looked to me as if the pellets were mostly fibres and seeds, neither of which would be digestible, so this may be an efficient way of extracting nutrition without filling up the gut with indigestible ballast.

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