KINGFISHER

 Kingfishers fly and scoop up their catch and fly back to a "WACKING" Perch - by that I mean they "wack" the legs etc. off the main body of the crab and eat that.  Later they regurgitate the unwanted shell - they seem to have the ability to get the meat out of the crab in their stomachs before the regurgitation process.  This shot interestingly shows the eye cover as the bird wacks the crab from side to side.   The eye cover is called a nictitating membrane which offers protection to the eye as it wacks the legs off.