Sabine's Gull in Flight
Xema sabini or Larus sabini

f10 @ 1/1250s, ISO:800, Nikon D300S w 300mm

"Sabine's Gull," Wikipedia, the free encyclopedia.This species is easy to identify through its striking wing pattern. The adult has a pale grey back and wing coverts, black primary flight feathers and white secondaries. The white tail is forked. The male's hood darkens during breeding season. Their bills are black with a yellow tip. Young birds have a similar tricoloured wing pattern, but the grey is replaced by brown, and the tail has a black terminal band. The juveniles take two years to attain full adult plumage. They have a very high-pitched and squeaking call.
Cambridge Bay, Nunavut, Canada