"Zoonomen - Zoological Nomenclature Resource" maintained by Alan P. Peterson at http://www.zoonomen.net
Reference for:
Leucophaeus modestus
Source:
AOU Check-List (08-2011)
Acquired:
2011-08-26
Notes:
American Ornithologists' Union's "Check-list of North American Birds - List of the 2,078 Bird Species Known From the A.O.U. Check-list Area" (AOU Check-list, 7th edition, updated with Supplements 42-52), maintained at http://www.aou.org/
Reference for:
Leucophaeus modestus
Source:
IOC World Bird List, Master List v2.9
Acquired:
2011-08-26
Notes:
Master list and sub-lists are maintained at http://www.worldbirdnames.org/names.html, and 'virtually replace' Gill & Wright 2006 (Birds of the World, Recommended English Names)