Alex Mustard / A diver swimming through the Silfra fissure, a crack in the Earth's crust between the North American and Eurasian continental plates, which is filled with glacial melt water. In this photo the Am...
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Bernard Castelein / Two Common shelducks (Tadorna tadorna) in flight, male chasing another male over pond, Kruibeekse Polder, Belgium. April.
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Bernard Castelein / Common pochard (Aythya ferina) pair in flight with reedbeds behind, Kruibeekse Polder, Belgium. April.
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Bernard Castelein / Common pochard (Aythya ferina) male, in flight, Kruibeekse Polder, Belgium. April.
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Joel Sartore / Photo Ark / East Siberian eagle-owl (Bubo bubo yenisseensis) female looking round at the camera, Cotsworld Falconry Center, Batsford. Captive.
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Nick Upton / Common swift (Apus apus) young adult, landing briefly or "banging" to inspect a prospective nest box as its mate air brakes as it flies close by, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) landing at nest box, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) leaving nest box, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) young adult, approaching nest box it has just begun nesting in, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) entering nest box it is nesting in, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) leaving nest box it is nesting in, Box, Wiltshire, UK. June.
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Nick Upton / Common swift (Apus apus) air braking as it flies close to a nest box it has just begun nesting in, Box, Wiltshire, UK. June.
