Clark's grebe
Water bird seen on Lake Havasu from the shore of Bill Williams River National Wildlife Refuge, western Arizona.
The refuge protects the lower course of the Bill Williams River to its mouth at Lake Havasu reservoir [wiki].
Western Grebe and Clark's Grebe are almost identical but are different species or regarded as subspecies.
Info: 'Clark's grebe... have whiter flanks and paler gray backs when comparing (to western grebe)... The western grebe has black around the eyes and a straight greenish-yellow bill whereas the Clark's grebe has white around the eyes and an up-turned bright yellow bill.' - Western grebe, wiki
'Western and Clark's Grebe were only split into two distinct species in 1985, as prior to that, they were regarded as one species. The two species are very similar, especially in their winter plumage when their primary differentiating characteristic (facial pattern) becomes nearly identical (much less dark around the eye in winter-plumaged Western Grebes). Winter-plumaged birds are best distinguished by bill color... Also note that intermediate birds are often seen. Extent of dark feathering around eye can vary widely in these birds, even in summer plumage, making identification even more difficult.' - www.sdakotabirds.com/diffids/western_clarks_grebe.htm
Clark's grebe
Water bird seen on Lake Havasu from the shore of Bill Williams River National Wildlife Refuge, western Arizona.
The refuge protects the lower course of the Bill Williams River to its mouth at Lake Havasu reservoir [wiki].
Western Grebe and Clark's Grebe are almost identical but are different species or regarded as subspecies.
Info: 'Clark's grebe... have whiter flanks and paler gray backs when comparing (to western grebe)... The western grebe has black around the eyes and a straight greenish-yellow bill whereas the Clark's grebe has white around the eyes and an up-turned bright yellow bill.' - Western grebe, wiki
'Western and Clark's Grebe were only split into two distinct species in 1985, as prior to that, they were regarded as one species. The two species are very similar, especially in their winter plumage when their primary differentiating characteristic (facial pattern) becomes nearly identical (much less dark around the eye in winter-plumaged Western Grebes). Winter-plumaged birds are best distinguished by bill color... Also note that intermediate birds are often seen. Extent of dark feathering around eye can vary widely in these birds, even in summer plumage, making identification even more difficult.' - www.sdakotabirds.com/diffids/western_clarks_grebe.htm