Andy Rouse / Espanola mockingbird, (Mimus macdonaldi), on beach, Galapagos

Robert Valentic / Eastern tiger snake (Notechis scutatus) female, Yarra River corridor in suburban Melbourne, Victoria, Australia, in mid-summer. She is in a defensive pre-strike position with hood expanded, accompanie...

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) in defensive posture, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) group on coast, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) basking, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador

Tony Phelps / Cape cobra (Naja nivea) spreading its hood, retreats into hole, De Hoop Nature Reserve, Western Cape, South Africa, January.

Ingo Arndt / Marine iguana {Amblyrhynchus cristatus} Hood Is, Galapagos

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) group resting on beach, Gardner Bay, Hood Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) pair on beach, Gardner Bay, Hood Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) group sleeping on beach, Gardner Bay, Hood Island, Galapagos Islands, Ecuador

Kirkendall-Spring / Hiker crossing Newton Creek, Elk Meadows Trail, Mount Hood Wilderness. Oregon, USA, July 2014. Model released.

Tui De Roy / Espanola mockingbird (Mimus macdonaldi) on beach, Galapagos