Moulting of a male Black-throated Sunbird

posted in: Feathers-maintenance | 3

Adrian Lim a.k.a. wmw998 photographed a Black-throated Sunbird (Aethopyga saturata) in Peninsular Malaysia in August 2008. What attracted his attention was the presence of a small red patch on its side and a blue patch near the base of the tail area (above). These colourful patches suggested to Adrian that the bird was in the process of changing into its breeding plumage.

Our bird specialist, R Subaraj has this to say: “Yes! You are correct. Both are young birds (top, above left) beginning to moult into adult male plumage. You can see bits of the right colours in the right places. The photo (above left) also distinctly shows the orange gape of a young bird.”

The Black-throated Sunbird, resident in Peninsular Malaysia, is not seen in Singapore. The adult male is a handsome bird with colourful plumage (above right).

All images by Adrian Lim.

This post is a cooperative effort between www.naturepixels.org and BESG to bring the study of bird behaviour through photography to a wider audience.

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3 Responses

  1. Great shots there. Quite amazing you can spot that bit of red and blue – even more amazing you can shoot the bird against a wooded setting. You picture is fit for the wall!

    There are more pictures of brilliant birds ( and other wildlife, too) here. Enjoy!

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  2. Albert Noorlander

    Probably less noticeable, but the lesser- and greater coverts of the top bird have all been replaced by the adult feathers as are the outermost tertial, central tail feather and a inner secondary. You can also see that the moult isn’t the same on both sides as the chestnut feathers have only developed on the right side and not the left side.

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  3. Thanks for pointing out.

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