Grey-rumped Treeswift at Bishan: 3. Conclusion

on 27th September 2015

Ling Kwee Chang’s two earlier posts on the Grey-rumped Treeswift (Hemiprocne longipennis) HERE and HERE established that incubation takes 21 day and the fledging 32 days. This compares favourably with Adam & Morten Strange’s 20-24 days for incubation and 28 days for fledging.

And Wells (1999) reported: “…combined development time exceeds 50 days (an egg in 7 June, hatched by 3 July with young newly on the wing on 1 Aug.). This works out to an incubation period of 26 days and fledging period of 29 days.

It has also been established that the Grey-rumped Treeswift indulges in cooperative breeding. This involves more than the two adult parents providing care to the developing chicks. These helpers come from non-breeding birds, often siblings from the last brood. They also assist in territorial defence and nest building.

Images are courtesy of Johnny Wee. From top to bottom: female incubating the egg and about to be relieved of her duty by the male; recently fledged chick; and juvenile.

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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