Enrique Lopez-Tapia / Hamer women in traditional clothing at the Jumping of the bulls ceremony. Ethiopia, November 2014

Juergen Freund / Chambered nautilus (Nautilus pompilius) with red whip coral. Osprey Reef, Great Barrier Reef, Queensland, Australia.

Stephen Dalton / Close-up of a shell, UK.

MYN / Lily Kumpe / Composite of seashells from beach on Bali, Indonesia. Meetyourneighbtous.net project

Sandra Bartocha / Sea shells in sand, North sea, Germany, September

Philippe Clement / Common / Edible cockle (Cerastoderma / Cardium edule) shells on beach, Belgium

Juergen Freund / Jewelmer Pearlfarm, Goldlip pearl oyster (Pinctada maxima) with golden pearl on beach, Palawan, Philippines, May 2009

Billy Black / Starfish in half Oyster (Lophia folium) shell lying on bed of seaweed. Pumpkin Island, Maine, USA.

Lynn M Stone / Mixed sea shells on beach, Sarasata, Florida, USA

Juan Carlos Munoz / Seashells collected outside Panyee fishing village. Phang Nga Bay, Andaman Sea, Thailand.

Juan Carlos Munoz / Seashells collected outside Panyee fishing village. Phang Nga Bay, Andaman Sea, Thailand.

Magnus Lundgren / Wild Wonders of China / Fiddler crab (Uca) male, hiding in an old shell at Ha Pak Nai mudflat, Yuen Long District, Hong Kong, China.