Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby in mothers mouth being carried from nest, Sante Fe, Argentina, February

Alex Mustard / Spinner dolphin (Stenella longirostris) pod socialising close to surface. Fury Shoal, Sataya Reef, Marsa Alam, Egypt.

Duncan Murrell / New Zealand giraffe weevil (Lasiorhynchus barbicornis), Lake Waikaremoana, North Island, New Zealand. New Zealand giraffe weevil is endemic to New Zealand and is its longest beetle in the world.

Alex Mustard / Common seahorse (Hippocampus kuda) female wrapping her prehensile tail around piece of wood on the seabed. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of a male short snouted seahorse (Hippocampus hippocampus) in sea oak seaweed (Halidrys siliquosa). Devon, England, United Kingdom. British Isles. English Channel. North East Atlantic Ocean.

Pascal Kobeh / Long-snouted seahorse (Hippocampus guttulatus) with prehensile tail twined round seagrass, Etang de Thau Lagoons, Languedoc-Roussillon, France.

Nuno Sa / Long snouted seahorse (Hippocampus guttulatus) in captive breeding laboratory at University of Algarve, Portugal. June 2010. Overall winner of the Underwater Photographer of the Year competition 2015.

Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby carried in mother's mouth from the nest, Sante Fe, Argentina, February

Michael Pitts,Michael Pitts / Spinner dolphins (Stenella longirostris) small pod in within Midway atoll, Midway, Pacific.

Mark MacEwen / Broad snouted caiman (Caiman latirostris) hatching from egg in nest, Sante Fe, Argentina, February

Doug Perrine / Hawaiian / Gray's / Long-Snouted Spinner Dolphins (Stenella longirostris longirostris) with mother and young calf. Keauhou, Kona, Hawaii, Central Pacific Ocean.

Wild Wonders of Europe / Zankl / Short snouted seahorse (Hippocampus hippocampus) Malta, Mediteranean, June 2009