This is a gull. Not a “seagull” because gulls fly nearly anywhere, including garbage dumps, parking lots, farm fields and not too far from the earth’s poles. They have the audacity to eat anything from French fries to live whale.
Yes. I have seen shorebirds standing on trees in Alaska. Perhaps it is safer? I guess insects are similar to crustaceans that other gulls eat. But I would like to see these gulls feeding... do the catch insects as they fly?