Matthew Maran / Meat offal, including sheep hearts, for sale at butchers counter. North London, England

Constantinos Petrinos / Man sitting outside a taverna, watching whole lamb and Kokoretsi (offal sausage) cooking on a spit, in preparation for Easter Sunday meal. Spetses Island, Aegean Sea, Greece, Mediterranean, April 200...

Mike Wilkes / Grey-headed gullls (Larus cirrocephalus poiocephalus) feeding on discarded fish offal, Tanji Beach, Gambia, west Africa.

Charlie Summers / Female African Lion (Panthera leo) burying the offal of a freshly killed Blue Wildebeest before going to cubs, Auob River Valley of the Kgalagadi Transfrontier Park, South Africa, June.

Brent Stephenson / Buller's Albatross (Thalassarche bulleri) feeding on fish offal on the sea with wings raised. The Pyramid, Chatham Islands, New Zealand, December.

Mike Potts / Two Northern / Hall's giant petrels (Macronectes halli) fighting over fish offal discarded from a fishing boat, off Kaikoura coast, South Island, New Zealand.