Small bird on the coast

Small bird on the coast

Observation - Small bird on the coast - UK and Ireland. Description: I saw this bird on the Isle of Grain. It bobbed it's tail a bit like a wagtail, but it's a bit fatter than the other wagtails I've seen. I've tried looking it up, but I'm a bit stumped.

I saw this bird on the Isle of Grain. It bobbed it's tail a bit like a wagtail, but it's a bit fatter than the other wagtails I've seen. I've tried looking it up, but I'm a bit stumped.