IUCN:Least Concern
It breeds in the mid-latitudes of the Eurasian continent and overwinters along the coast from Africa to Australia. It is also distributed on the Caribbean coast and the Hawaiian Islands.In Japan, it comes to the south of Honshu as a summer bird and breeds, but the number is decreasing as the number of breeding grounds decreases. Predation by crows is also a factor in the population decline.(Cited from Wikipedia)
a courtship feeding
a banded bird
Website
Information about bird banding of little tern from Environment ministry, and
Yamashina Institute For ornithology.