Abstract
We report the records of the recent 20 years of the Whiskered Tern Chlidonias hybrida in the Kochi Plain, Japan. Fouty-one observations were recorded from 1999 to 2018. The peak of the spring migration was late May, and the autumn migration was continued from early August to late October. We examined the tendency of this species by the rearranging of the observation records for the past 20 years, but the tendency of increase or the decrease was not confirmed. We regard this species as a passage visitor observed approximately every year in the Kochi Plain.
