From Steve Jarvis - I just read the surprising post on high level Oyster Catchers at
Stack Rocks. On the same day near Penberi I witnessed 2 aggressive
Ravens on the cliffs being dive bombed by high speed Oyster Catchers.
Later Fulmar and Chough joined in and a Greater Black Backed arrived.
This was on a fairly vertical cliff face. The dumpy Oyster Catchers in
vertical free fall was quite a sight, and they were also presumably
cliff face nesting.
