Lucas Bustamante / Moss rainfrog (Pristimantis eriphus) siting on leaf, Cosango, Napo Ecuador, Vulnerable species.

Ingo Arndt / Robber / Coconut Crab (Birgus latro) close up of head and legs, Christmas Island, Indian Ocean, Australian Territory

Neil Aldridge / Okavango robbers (Rhabdalestes maunensis) fish swimming up the temporary Selinda Spillway, northern Botswana. This shallow river cuts across the Kalahari Desert and joins the Okavango River system wit...

Bert Willaert / Rio Jatuntianhua Robber Frog (Pristimantis eriphus) male on a leaf. Ecuador, Vulnerable species.

Andy Sands / Robberfly (Machimus cingulatus) head close up showing large compound eyes. Captive, UK, July.

Wild Wonders of Europe / Ziegler / Robber flies (Asilidae) mating, one with insect prey, The Peloponnese, Greece, May 2009

Wild Wonders of Europe / Smit / Robber fly (Asilidae) with mosquito prey hanging from leaf, Gornje Podunavlje Special Nature Reserve, Serbia, June 2009

James Christensen / Almirante Robber Frog (Craugastor talamancae), Colon, Panama

Piotr Naskrecki / Ogre-faced Spider (Deinopis sp) do not wait passively for an insect to fall into their web, instead, they cast sticky nets, La Selva Biological Station, Costa Rica

Doug Perrine / Coconut / Robber crab climbing palm tree {Birgus latro} Palau, Micronesia

Mark Moffett / Caribbean Tree Frog (Eleutherodactylus coqui) parachuting from tree, this frog holds a cup of air beneath it with its arms as if it were a parachute, leaping to the ground each morning, Puerto Rico

Pete Oxford / Coconut (Robber) crab climbing coconut tree, Aldabra Seychelles