Observations on House Crow-Asian Koel interactions

on 22nd August 2011

Prakash Garde of Pune, India, documented the activities of a pair of House Crow (Corvus splendens) building their nest within a short period of seven days. The female then laid a clutch of eggs that subsequently turned bad when the temperature rose above 42º C in the shade on two consecutive days. The crows then built another nest in a nearby tree that yielded three Asian Koel (Eudynamys scolopacea) chicks.

Prakash reported how a group of eight Asian Koels living within the vicinity, four males and four females, kept watch on the crows’ nest. The female koels eventually laid their eggs in the crows’ nest when the latter were not around. This was at about 0545 hours when it was sill dark. The koels (both sexes) kept visiting the nest after laying their eggs. On two occasions they were seen at the nest for sufficiently long durations, with the male seemingly eating something.

When the chicks hatched in the crows’ nest, they were fed regularly by their foster parents. The koels were not observed feeding the chicks.

What was also not observed was the male koel luring the incubating crow from the nest before the female koel sneaked into the nest to lay her egg. Similarly, the removal of the crow’s egg by the koel was not observed. However, there was the possibility of the male koel eating the crow’s egg during the pair’s visit to the nest after the female koel laid her egg.

Another observation was that the iris of the koel chick was black, as compared to the red iris of the adult. Could this be an adaptation to avoid detection by the crows that the chick was not theirs? Prakash argued that as the crows are not able to recognise a koel chick whose plumage is radically different from their own, “it is hard to believe that they would detect the colour of its iris. The changing of the colour of iris in adulthood may, therefore, have some other significance.”

Prakash Garde
Pune, India
August 2011

Prakash Garde (2011), A note on the observations of House Crows nests. Newsletter for Birdwatchers 51(1), 2-4.

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.

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