Caspian tern is the largest of all terns. It is unmistakable with its characteristic large red bill with dark tip. It is a common migrant to dry zone coastal areas of Northern half of the island and coastal wetlands and tanks of Hambantota district. It is less common in wet zone. Breeding birds were observed also from sand banks of
Adam’s bridge and resident population present in Negombo lagoon (Kotagama
& Ratnavira 2010). Caspian tern is
usually seen flying solitarily or in pairs and resting on sand banks often
companies with other terns.