Thordis Fridriksson on BBC Radio Cambridgeshire Nature in Focus: Bittern Ian Barthorpe has been telling Kev all about the beautiful bird with an interesting call. 8 mins ...

Simon Wotton, RSPB senior conservation scientist, said: "These bittern breeding success stories ... Bitterns are known for their loud "booming" call, produced by the males, which can be heard ...

Bittern numbers have increased by a fifth in ... Bitterns are known for their loud "booming" call, produced by the males, which can be heard up to three miles away. Ben Andrew/RSPB/PA Media ...