Mystery Bird: Grey-backed Camaroptera, Camaroptera brachyura

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[Mystery bird] Grey-backed Camaroptera, also known as the Grey-backed Bleating Warbler, Camaroptera brachyura (brevicaudata), photographed in Tarangire National Park, Tanzania, Africa. [I will identify this bird for you in 48 hours]

Image: Dan Logen, 31 August 2007 [larger view].

Nikon D2X, ISO 200, Nikon 200-400 VR lens at 400 mm. f/4. 1/160.

Please name at least one field mark that supports your identification.

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Its a Grey-backed Camaroptera Cameroptera brevicaudata
Olive wings and grey back