RSPB apologist
Yesterday (1st June) an apologist from the RSPB gave BBC Radio 4's PM programme the following explanation:
It's the computer's fault!
Apparently their blog filter replaced cock by ****.
As you rightly point out though, there's plenty of tits and even a few shags (a water bird like a cormorant the RSPB rep hastily said) on the RSPB site.