White-winged Tern (non-breeding) in flight over the lake

White-winged Tern (non-breeding) in flight over the lake - White-winged (Black) Tern
Near Robert's Camp, Lake Baringo, Rift Valley province, Kenya (August 2010)

Also known as the White-winged Black Tern

For more information on this bird species see the following links:
White-winged Tern / Internet Bird Collection
White-winged Tern / Bird Forum
Chlidonias leucopterus / IUCN Red List of Threatened Species
White-winged Tern Chlidonias leucopterus / BirdLife International