The week in wildlife – in pictures

Spectacular murmurations of wading birds near Snettisham in Norfolk, UK. Photograph: Toby Melville/Reuters

A sea urchin observed with an underwater camera at the Gulf of İzmit in Kocaeli, Turkey. There are about 1,000 species of sea urchins in the world’s seas. The main food source of sea urchins is algae, they cannot live in poor water conditions as they are known for being food for many creatures in marine life Photograph: Anadolu Agency/Getty Images

A coot swims through duckweed covering the surface of Limehouse Basin marina, London, UK, as the recent warm weather has caused the floating weed to proliferate, starving the water of oxygen much needed by aquatic wildlife, and posing a risk to animals that might mistake it for grass Photograph: Susannah Ireland/Reuters