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 / Black-axil Chromis (Chromis atripectoralis) blurred motion photograph. Bilang Bilangang Island, Danajon Bank, Central Visayas, Philippines, April

Juergen Freund / Shoal of Blue chromis (Chromis viridis) amongst hard coral with Cloudy Damselfish (Dascyllus carneus) Sipadan, Malaysia.

Georgette Douwma / Bigscale soldierfish (Myripristis berndti), Sweetlips, Philippine chromis with Blueline snappers in background. Komodo National Park, Indonesia

Wild Wonders of Europe / Banfi / Shoal of Mediterranean / Blue damselfish (Chromis chromis) Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Banfi / One of the deeper artificial reefs surraunded by Damselfish (Chromis chromis) with a Comber (Serranus cabrilla) in the middle, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Pascal Kobeh / Bluegreen puller (Chromis viridis) and camouflaged Variegated lizardfish (Synodus variegatus) on sea floor, at night. Indian Ocean, Madagascar.

Gary Bell/ Oceanwide / Blue-green Chromis (Chromis viridis) school in reef, Great Barrier Reef, Australia

Pascal Kobeh / Azores chromis / Atlantic damselfish (Chromis limbata) Azores, Atlantic Ocean.

Pascal Kobeh / Azores chromis / Atlantic damselfish (Chromis limbata) Azores, Atlantic ocean.

Pascal Kobeh / Azores chromis or Atlantic damselfish (Chromis limbata) Azores, Atlantic ocean.

Tim Fitzharris / Butterflyfish (Chaetodon sp), Cavalla (Caranx sp), Parrotfish (Scaridae), and Damselfish (Chromis sp) school, Balicasag Island, Philippines