tern again

Its head scratching time at the pits again as the migrants continue to trickle through. Dunc came across a couple of Arctic Terns amongst the Commons, so I headed up to the sailing club to see if I could get a few pictures. The flat light helped to capture plumage details, but I was most taken by the structural differences between the two species. The long sharp heads of the Commons contrasted with the rounder-headed, fuller chested Arctics. Even subtle differences such as the amount of white above the gape all go to creating the overall  form.