Bitterns
The Barry White of the bird world, the bittern is all about the bass.
Their call is described as 'booming' and in order to produce this extraordinary noise, the males draw their heads into their bodies and inflate their necks rather like a balloon.
This makes their vocal cords wider and allows for a deep sound that can carry far through their waterlogged reedbed habitat to attract a mate.
Find out more about bitterns in our birdguide.