A basking shark drew a crowd of spectators to Portrush Harbour for several hours on Wednesday, Andrew Hill of Troggs Surf Shop in Portrush took these photographs

Basking sharks feed on plankton and small sea creatures

Basking sharks are so-called because they like to swim slowly just below the surface as if 'basking' in the sun

Basking sharks can grow to 14m or 46ft long, among fish only whale sharks grow larger

The unusual visitor caused large crowds to gather