Something top center with what looks like big wings up. Can't zoom so not sure what it is.
That is a brown skua DorosZoo ... you will find them on the other list. They predate on eggs and chicks to feed their chicks.
by yshish moderator, translator
Yep, as @coldcounter said, it is a Brown Skua. You can recognize them by the white V shaped patterns on their wings (when spread).