Doc White / California sea otter (Enhydra lutris) feeding on Northern kelp crab, Monterey Bay, California, USA, Eastern Pacific Ocean, May

Christophe Courteau / Velvet swimming crab portrait {Liocarcinus / Necora puber} Brittany France

Linda Pitkin / 2020VISION / Velvet Swimming Crab (Necora puber / Liocarcinus puber), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, October, 2011

Juergen Freund / Horsehoe crab (Tachypleus gigas) swimming on its back with gills creating the propulsion, Palawan, Philippines. Did you know? Horseshoe crabs are more closely related to spiders than crabs.

Graham Eaton / Velvet swimming crab (Necora puber) pair mating, Trefor, Wales, UK, July.

Shane Gross / Unknown species of pelagic swimming crab, covered in barnacles swimming in the open ocean at night. She is tending to her eggs in a pouch. Anilao, Philippines.

Nick Hawkins / Invasive European green crabs (Carcinus maenas) collected by park staff in Kejimkujik Seaside National Park near Port Joli, Nova Scotia, Canada. July.

David Fleetham / Imperial commensal shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer nudibranch (Hexabranchus sanguineus) at night. Philippines.

Magnus Lundgren / Wild Wonders of China / Swmming crab close to the surface, Sharp Island or Kiu Tsui Chau, Country Park, Hong Kong, China.

Juergen Freund / Mud crabs (Scylla serrata) in the water by the mangrove roots - split level image, Mali Island, Macuata Province, Fiji, South Pacific

Juergen Freund / Mud crabs (Scylla serrata) in the water by the mangrove roots - split level image, Mali Island, Macuata Province, Fiji, South Pacific

Juergen Freund / Mud crabs (Scylla serrata) in the water by the mangrove roots - split level image, Mali Island, Macuata Province, Fiji, South Pacific