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First report of Cooperative Breeding in Grey-rumped Treeswift

on 22nd May 2014

Wong Weng Fai’s excellent video clip of the Grey-rumped Treeswift (Hemiprocne longipennis) provides clear proof of cooperative breeding. According to Erritzoe et al. (2007), this is where “more than two individuals provide care to a single brood of offspring.” The extra help comes from non-breeding birds who are siblings from the last brood. These helpers assist in territorial defence, nest building and the rearing of the nestlings.

In the video clip below, it is noted that the female gave way to the male who then moved sideways to the nest to incubate the egg, see also HERE. He then proceeded to peck on the nest rim, probably, as reported in the Whiskered Treeswift (Hemiprocne comata) by Chantler (1999), to add saliva and feathers. The male Grey-rumped Treeswift then looked around and another male suddenly flew in (see screen grab above, egg arrowed). The second male then took over the incubation of the egg.

Among the family of treeswifts (Hemiprocnidae) there is no record of cooperative breeding (Wells, 1999). However, such breeding has been known in Chimney Swift (Chaetura pelagica) (Family Apodidae) (Chantler, 1999).

According to Dr David Wells, “Quite a discovery (!) although these birds can be pretty gregarious – at times up to 50+ foraging out of the same tree crown. I had always assumed that that was a non-breeding season activity, but maybe think again. Not birds that it would ever be easy to mark, unfortunately.”

And Morten Strange added: “…I remember some years back seeing an astonishing flock come out of the rainforest at the Singapore Botanical Gardens. I was standing on the exercise ground when a sparrowhawk flew overhead and spooked them into the air. There might have been as many as 50 although I couldn’t really count them and they quickly settled back into the canopy again. Now it seems that the species is also social during breeding, although this video might be the first actual proof showing two males tending to the same nest.”

Wong Weng Fai (video), Dr David Wells, Morten Strange, Jeremiah Loei & Wang Luan Keng
Singapore
May 2014

References:
1.
Chantler, P., 1999. Family Apodidae (Swifts). In del Hoyo, J., A. Elliott & J. Sargatal (eds.), Handbook of the birds of the world. Vol. 5. Barn-owls to hummingbirds. Lynx Editions, Barcelona. Pp.388-457
2. Erritzoe, J., K. Kampp, K. Winker & C. B. Frith, 2007. The ornithologist’s dictionary. Lynx Edicions, Barcelona. 290 pp.
3. Wells, D. R., 1999. Family Hemiprocnidae (Tree-swifts). In del Hoyo, J., A. Elliott & J. Sargatal (eds.), Handbook of the birds of the world. Vol. 5. Barn-owls to hummingbirds. Lynx Editions, Barcelona. Pp. 458-466.

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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