Ralph Pace / Humpback Whale (Megaptera novaeangliae) male and female courting, Maui, Hawaii, image taken under NMFS Permit # 19225

Tui De Roy / Split level view of Brown pelicans (Pelecanus occidentalis) feeding, Tortuga Bay, Santa Cruz Island, Galapagos

Theo Bosboom / Split level view of autumn leaves underwater and tree reflections on the water surface, Levenumse beek, the Netherlands, November.

Ingo Arndt / American alligator (Alligator mississippiensis) split level, Everglades, USA, January.

Pete Oxford / Brown Pelican (Pelecanus occidentalis) on water, Urbina Bay, Isabela Island, Galapagos Islands, Ecuador

Suzi Eszterhas / Pygmy Three-toed Sloth (Bradypus pygmaeus) swimming in mangrove forest, Isla Escudo de Veraguas, Panama

Alex Mustard / Grey seal (Halichoerus grypus) split level view of young investigating camera lens, Lundy Island, Devon, UK, Bristol Channel, August

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) split level view, New Zealand, March.

Jordi Chias / Split level view of Blue shark (Prionace glauca) at surface at sunset, Azores Islands, Portugal, Atlantic Ocean

Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) resting in shallows, possibly to thermoregulate, Carnac Island, Western Australia.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.