Great Bittern
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Botaurus stellaris
Rare & local breeder of 110 Males in Britain & 600 which Winter from October-March from the Continent.
Also occurs in Europe.
Other birds moving to Britain in Winter from the Continent.
Adults have black crown, moustachal stripe, green legs & brown body.
They've got a distint booming song, which is heard in the Spring.
The flight is a bit Owlish, but often show the legs trailing behind.