Matthew Maran / Jacare caiman {Caiman crocodilus yacare} looking menacing, Pantanal, Brazil

Anup Shah / Nile crocodile {Crocodylus niloticus} walking and looking menacing, Katavi NP, Tanzania

Bernard Castelein / Menacing view of American alligator (Alligator mississippiensis) Everglades NP, Florida, USA

Michael Pitts / Komodo dragon (Varanus komodoensis) next to wallowing Water buffalo, Komodo Island, Indonesia

Hans Christoph Kappel / Spectacled Caiman (Caiman crocodilus) with eyes just visible above water level, Pantanal wetlands, Brazil

Anup Shah / Ruppell's griffon vulture wings open in aggressive posture {Gyps rueppellii} Serengeti NP Tanzania, East Africa

Staffan Widstrand / Close up of Nile crocodile head {Crocodylus niloticus} Selous Game Reserve, Tanzania

Staffan Widstrand / Piranha {Serrasalmidae family} Pantanal, Brazil.

Jabruson / Turbulent dark rain clouds Bwindi forest NP, Uganda

Pete Oxford / Piranha under aquatic plants {Serrasalmus sp} captive Amazonia, Ecuador

Doug Perrine / Grey reef sharks {Carcharhinus amblyrhynchos} Bikini Atoll, Micronesia (Non-ex).

Doug Perrine / Oceanic whitetip shark {Carcharhinus longimanus} Hawaii, Pacific Ocean (Non-ex).

Mary McDonald / Nile crocodile in middle of muddy river {Crocodylus niloticus} Ewasi Nyiro River, Kenya

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos}, Great Barrier reef, Queensland, Australia

Anup Shah / Indian gharial {Gavialis gangeticus} head reflected in water, India, Endangered species.

Jabruson / Turbulent dark rain clouds Bwindi forest NP Uganda