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

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

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

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

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

Hanne & Jens Eriksen / African skimmers (Rynchops flavirostris) two in shallow water along the beach, Oman, February

Tony Heald / Black Skimmer (Rynchops flavirostris) juvenile, Pantanal, Brazil

Tony Heald / Black Skimmer (Rynchops flavirostris) flying over water with Yacare caiman (Caiman yacare) in background, Pantanal, Brazil

Tony Heald / Black Skimmer (Rynchops flavirostris) young chick on sand bank, Pantanal, Brazil