Herons, Egrets & Bitterns 
Worldwide there are 63 members of the family Ardeidae, which comprises all the Herons, Egrets and Bitterns.  Of the Herons, only Grey is a common resident with Purple and Night Herons making annual visits to the UK.  Squacco Heron is a rare vagrant and Mangrove Heron (Green Heron) an extremely rare visitor from N America.  Little Egret is now well established as one of the newer breeding species in the UK and in 2008 a pair of Cattle Egrets also bred in Somerset; a first for the UK.  They were present for all the year in Cornwall as well and a breeding record for 2009 will not be surprising.  Great Egret is a rare vagrant.  A few pairs of Great Bittern breed in the UK and some overwinter in Cornwall.  Little Bittern is rare and American Bittern rarer still.

Photos

Grey Heron

Little Egret

Cattle Egret

Black-crowned Night Heron

Squacco Heron