Terry Whittaker / Grey heron ( Ardea cinerea) flying to bin. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Nick Garbutt / Baby Spot-tail Sharks (Carcharhinus sorrah) on sale in fish souk (market) all caught in the Persian Gulf and many bound for markets in Asia. Sharjah, United Arab Emirates. April 2013

Roland Seitre / Southern bluefin tuna (Thunnus maccoyii) in fish cage of fish farm, Port Lincoln, South Australia, Critically Endangered species. Wild caught fish are reared in large fish cages for maximum growth bef...

Michele Westmorland / Friday night market in the fishing village of Gouyave, Grenada, West-Indies, Caribbean, May 2009.

Juergen Freund / Vendors selling fish (including Pufferfish) in the Wangi Wangi afternoon public market. Wakatobi, Sulawesi, Indonesia, November 2009.

SCOTLAND: The Big Picture / Fresh fish in ice at Peterhead fish market, Scotland, UK, September 2017.

SCOTLAND: The Big Picture / Fresh fish in ice at Peterhead fish market, Scotland, UK, September 2017.

SCOTLAND: The Big Picture / Fresh fish in ice at Peterhead fish market, Scotland, UK, September 2017.

Terry Whittaker / Grey Heron ( Ardea cinerea) at fish market waiting to scavenge scraps of food. Amsterdam, Netherlands. April 2017.

Terry Whittaker / Grey Herons ( Ardea cinerea) congregating around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey Herons ( Ardea cinerea) congregating around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey Heron ( Ardea cinerea) congregating around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.