Jordi Chias / Crocodile icefish or White-blooded fish (Channichthyidae), Antarctic Peninsula, Antarctica.

Neil Aldridge / Nile crocodile (Crocodylus niloticus) snatching a Mozambique tilapia (Oreochromis mossambicus) in its jaws, Shingwedzi River, Kruger National Park, South Africa.

Claudio Contreras,Claudio Contreras / Crocodile Flatheadfish (Cymbacephalus beauforti), Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Steven David Miller / Australian freshwater / Johnstone's crocodile (Crocodylus johnsoni) with fish in mouth, a scrap from a fisherman, Lake Kununurra, Western Australia, July

Juergen Freund / Crocodile snake eel {Brachysomophis crocodilinus} burrowing in sediment.

David Hall / Crocodile snake eel (Brachysomophis henshawi), head sticking out of gravel. Pantar, Alor Archipelago, Indonesia.

David Hall / Crocodile snake eel (Brachysomophis henshawi) peering out of burrow. Pantar, Alor Archipelago, Indonesia.

Jordi Chias / Crocodile icefish or White-blooded fish (Channichthyidae), Antarctic Peninsula, Antarctica.

Jordi Chias / Crocodile icefish or White-blooded fish (Channichthyidae), Antarctic Peninsula, Antarctica.

David Fleetham / Hawaiian cleaner wrasse (Labroides phthirophagus) feeding on parasites on Crocodile needlefish (Tylosurus crocodilus) with coral reef below. Hawaii.

David Fleetham / Crocodile snake eel (Brachysomophis crocodilinus), awaiting prey. Hawaii.

Franco Banfi / Crocodile snake eel (Brachysomophis crocodilinus) hiding in sand, Pura Vida House Reef, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.