When they get a tern or pelican to drop a fish, they plunge down and grab it off the surface of the water, which may have been how this bird got oiled.

当他们让一只燕鸥或鹈鹕扔下一条鱼时，他们会一头栽到水里，然后把鱼从水面抓起来，这可能就是这只鸟被油弄脏的原因。