Neil Aldridge / Little Terns (Sterna albifrons) in courtship display are reflected in the water of salt flats. The male calls and throws his head back after passing a fish to the female. The Algarve, Portugal, May.

Neil Aldridge / A male Little Tern (Sterna albifrons) passes a fish to a female as part of a courtship behaviour. The display is reflected in the water of salt flats in the Algarve, Portugal, May.

David Woodfall / Arctic tern (Sterna paradisaea) in flight predating a Little tern (Sternula albifrons) chick, Northumberland, UK

David Woodfall / Freshly blown sand, indicative of vulnerable nature of the Little tern (Sterna albifrons) breeding habitat, Northumberland, UK, June 2009

David Woodfall / Long Nanny nesting colony area of Little terns (Sterna albifrons) and Arctic terns (Sterna paradisaea) Northumberland, UK, June 2009

David Woodfall / Little tern (Sternula albifrons) pair displaying aggression towards Arctic tern (Sterna paradisaea) above, Northumberland, UK

David Woodfall / Arctic tern (Sterna paradisaea) predating a Little tern (Sternula albifrons) chick, Northumberland, UK

David Woodfall / Arctic tern (Sterna paradisaea) in flight and Little tern (Sterna albifrons) on nest fighting, the Little terns having invaded the Arctic terns breeding space, Northumberland, UK

Jean E. Roche / Common tern {Sterna hirundo} and Little tern {Sterna albifrons} eggs in nest, Camargue, France