Neil Aldridge / African skimmer (Rynchops flavirostris) flying low over the Chobe River, skimming the water, at sunset, Chobe National Park, Botswana.

Neil Aldridge / African skimmer (Rynchops flavirostris) resting on a sandbank in the middle of the Chobe River between Botswana and Namibia.

Tony Heald / Black skimmer (Rynchops flavirostris) fishing by skimming along water surface, Pantanal, Brazil

Winfried Wisniewski / African Skimmer (Rynchops flavirostris) skimming, Chobe River National Park, Botswana

Winfried Wisniewski / African Skimmer (Rynchops flavirostris) pair fighting in flight, Chobe River National Park, Botswana

Winfried Wisniewski / African Skimmer (Rynchops flavirostris) pair fighting in flight, Chobe River National Park, Botswana

Tony Heald / African skimmer skimming {Rynchops flavirostris} Chobe NP, Botswana

Yashpal Rathore / African skimmer (Rynchops flavirostris) near Chobe River, Chobe National Park , Botswana.

Ann & Steve Toon / African skimmer (Rynchops flavirostris), Chobe river, Botswana, August

Christophe Courteau / Nile crocodile (Crocodylus niloticus) entering water with African black skimmers (Rynchops niger) in background, Lake Albert, Uganda

Hanne & Jens Eriksen / African skimmers (Rynchops flavirostris) two in flight in synchronised feeding along the beach, Oman, February

Hanne & Jens Eriksen / African skimmer (Rynchops flavirostris) in flight along the beach, Oman, February