Sooty Chat

Myrmecocichla nigra

There are two similar dark chats which are locally distributed in south-western Kenya/northwestern Tazanania. The Sooty Chat, shown here, is found mostly in the Masai Mara and Serengeti NPs. it has a white patch at the bend of the wing.
The largely allopatric Northern Anteater Chat has a large white patch on its primaries, which can be hidden when the bird is at rest.