Scolder
Eurasian Oystercatchers have no fear. They’re happy to make the lives of any other bird, or even human, a misery with their constant alarm calls and physical attacks. Here’s one harassing a Great Skua.
Here on Westray, in Orkney parlance, it’s a Chaldro chasing a Bonxie.

Bonxies will happily pluck a bird out of the air and kill it. Does that worry an Oystercatcher?

Not a bit of it. It’s the Great Skua which is high-tailing it out of there.

It’s the perfect welcoming party to Westray. Personally I’ll be steering well clear of both of them.