basis of recordHarrison, P. (1985). Seabirds: an identification guide. Revised edition. Christopher Helm Publisher. A & C Black: London, UK. ISBN 0-7136-3510-X. 448 pp. (look up in IMIS) [details]
Present Inaccurate Introduced: alien Containing type locality
Unreviewed
Remark Zimmerman classifies terms as Laridae. <314> [details]