Pecking order

I'm lying peacefully on my sunbed when all hell breaks loose above me. The recent residents of this mast on the front of the cruise ship are objecting to this even more recent newcomer and are repelling it with pecks and squarks.

We are 1000 miles from the nearest land, so I am told ,so how they knew we are here is beyond me.

Looks like its something else I will have to learn about.