The brown-headed cowbird is never going to win any parenting awards.

BIRDS
Lots of beach-goers find seagulls annoying, but usually the only harm they do is snatching away poorly-guarded snacks. On one particular beach, though, scientists have found that some gulls have a much more aggressive and grisly way of getting their meals
Even biologists who study these birds have a hard time telling them apart.
They can board planes to Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, Pakistan, Morocco, and Syria (with their handlers, of course).
The seagull—scourge of the beach-blanket snacker, parking-lot pest—is nobody's favorite. Birding guides will tell you that seagulls have no natural enemies, which is mostly true. But once in a while, somebody’s had enough.
It’s not just people that harness energy from power plants - birds also use them in their own way.