Alex Mustard / A young Spiny / Yellow / Longsnouted Seahorse (Hippocampus guttulatus), in an aquarium attached to plastic seagrass leaves. This seahorse is part of a UK seahorse breeding program. Photographed at the...

Alex Mustard / A female Spiny Seahorse (Hippocampus guttulatus) in weeds. Sardina, Gran Canaria, Canary Islands, East Atlantic Ocean, October.

Alex Mustard / A male Lined / Northern Seahorse (Hippocampus erectus) beside some coral polyps at night. West Palm Beach, Florida, USA, March.

Alex Mustard / A male Spiny Seahorse (Hippocampus guttulatus) hides in seagrass. Etang De Thau (Thau Lagoon), Montpellier, France, Europe, September.

Juergen Freund / Estuary / Spotted / Common seahorse (Hippocampus kuda) in the rubble. Lembeh Strait, Sulawesi, Indonesia

Tim Laman / Denise's Pygmy seahorse (Hippocampus denise) camouflaging itself in a Sea Fan. Yellow colour form. Pisang Islands, West of Fak Fak Peninsula. West Papua, Indonesia, April 2007

Wild Wonders of Europe / Zankl / Short snouted seahorse (Hippocampus hippocampus) portrait, Malta, Mediteranean, June 2009 WWE BOOK PLATE. WWE OUTDOOR EXHIBITION

Fred Bavendam / Long-snouted Seahorse (Hippocampus reidi) portrait, Bonaire, Netherland Antilles

Alex Mustard / Yellow longsnout seahorse (Hippocampus reidi) female holds onto a sea rod with its prehensile tail, on a coral reef. West Bay, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Common seahorse (Hippocampus kuda) female gripping onto a piece of waterlogged wood with her prehensile tail. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Sergio Hanquet / Short-snouted seahorse (Hippocampus hippocampus). Tenerife, Canary Islands.

Pascal Kobeh / Long-snouted seahorse (Hippocampus guttulatus), Canary Islands