First report of Cooperative Breeding in Grey-rumped Treeswift

posted in: Nesting, Videography | 8

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
May 2014

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.


8 Responses

  1. Liao Weijie

    Extraordinary. Great documentary!

  2. Full credits to videographer Wong Weng Fai.

  3. Kurrypok

    Nat Geo documentary in the making ! Way to go Uncle Fai!

  4. […] in the world among the Grey-rumped Treeswift (Hemiprocne longipennis) documented by Wong Weng Fai LINK and the first recorded breeding in Singapore of the Green Imperial-pigeon (Ducula aenea), a rare […]

  5. […] was an account of cooperative breeding among the Grey-rumped Treeswifts (Hemiprocne longipennis) LINK. Credit goes to photographer Wong Weng Fai when he documented the female treeswift flying off and […]

  6. […] excellent example is Wong Weng Fai’s video clip (reproduced above) of adult Grey-rumped Treeswifts (Hemiprocne longipennis) feeding a nestling. […]

  7. […] in turn gave way to another male. The video clip showing this move by Wong Weng Fai can be viewed HERE – the first ever evidence of cooperative […]

  8. […] 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 […]


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