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

Nick Upton / Slender-footed robberfly (Leptarthrus brevirostris) standing on Yellow rattle flower (Rhinanthus minor), chalk grassland meadow, Wiltshire, UK, June.

Nick Upton / Violet black-legged robber fly (Dioctria atricapilla) with a hoverfly as prey, chalk grassland meadow, Wiltshire, UK, June.

Nick Upton / Violet black-legged robber fly (Dioctria atricapilla) with Dashed slender robber fly (Leptogaster guttiventris) prey, chalk grassland meadow, Wiltshire, UK, June.

Wild Wonders of Europe / Muñoz / Robberfly (Asilidae) with damselfly prey, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanc, Castilla y Leon, Spain

Wild Wonders of Europe / Muñoz / Robberfly (Asilidae) feeding on damselfly Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanc, Castilla y Leon, Spain

Alex Hyde / Robber Fly (Asilidae) overhead view photographed on a white background. Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

Will Watson / Robberfly (Asiidae) with a captured skipper butterfly (Hesperidae), Manabi Province, Ecuador.

Kim Taylor / Hornet robber fly (Asilus crabroniformis) with fly prey (Larvaevora sp), Dorset, England, September

Claudio Contreras / Robber Fly (Diogmites sp.) hanging from leaf, feeding on fly prey. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Roland Seitre / Ruiz's Robber Frog (Eleutherodactylus / Strabomantis ruizi). Captive. Cali Zoo, Cali, Colombia.

Pete Oxford / Diadem Robber Frog (Eleutherodactylus diadematus), Yasuni National Park, Amazon, Ecuador

Pete Oxford / Canelos Robber Frog (Pristimantis acuminatus), Yasuni National Park, Amazon, Ecuador

Roland Seitre / Rusty robber frog (Strabomantis bufoniformis) El Valle Amphibian Conservation Center, Panama, Central America

Andy Sands / Hornet Robberfly (Asilus crabroniformis) on ling heather (Calluna vulgaris) West Sussex, England, UK, August.

Nick Upton / Robber fly (Saropogon sp) on twig, hunting for prey in amongst coastal vegetation, Samos, Greece, August.

Nick Upton / Robber fly (Saropogon sp) hunting for aerial prey on pebble beach, Samos, Greece, August.

Nick Upton / Robber fly (Saropogon sp) on twig, hunting for prey in amongst coastal vegetation, Samos, Greece, August.

Piotr Naskrecki / Whistling Frog (Eleutherodactylus johnstonei) feeding on insect prey, Saba, West Indies, Caribbean

Nick Upton / Kite tailed robberfly (Machimus atricapillus) resting on limestone boulder, Wiltshire, UK, August.

Bert Willaert / Male Cachabi Robber Frog (Pristimantis achatinus) calling, vocal sac inflated. Ecuador, South America.

Bert Willaert / Male Robber Frog (Pristimantis sp.) calling, vocal sac inflated. Cajas National Park, Ecuador.

John Abbott / Bee Like Robberfly (Laphria saffrana) feeding on a Burrowing Bug (Cydnidae), Big Creek Scenic Area, Sam Houston National Forest, Texas, USA

John Abbott / Robber fly (Efferia prob. snowi) female in flight, Wild Basin Preserve, Texas, USA, April

Nick Upton / A rare species of Robber fly (Pycnopogon mixtus) on coastal flower watching for aerial prey from a flower bud in coastal sand dunes, Lesbos (Lesvos), Greece, May.

John Abbott / Robber fly (Ommatius sp.) feeding on Acanaloniid planthopper, Neches River, Texas, USA, June

Konrad Wothe / Robber-fly (Asilidae) in rainforest, Mission Beach, near Innisfail, Queensland, Australia, October

Bernard Castelein / Robberfly (Asilidae) on discolouring dock leaf (Rumex acetosa), Brasschaat, Belgium, June

B&S Draker / Robber Fly (Asilidae) adult with butterfly prey. Starr County, Rio Grande Valley, Texas, USA.

Nick Upton / Common Red-legged Robber Fly (Dioctria rufipes) sun basking on a leaf. Wiltshire garden, UK, May.

David Welling / Robber Fly (Microstylum morosum) perching on a dead flower stalk. Travis County, Texas, USA, June.

Nick Upton / Large Robber Fly (Machimus modestus) female with small solitary bee prey. Zadar province, Croatia, July.

Nick Upton / Large Robber Fly (Machimus modestus) male resting on rock. Zadar province, Croatia, July.

Nick Upton / Large Robber Fly (Machimus modestus) female with small solitary bee prey. Zadar province, Croatia, July.

Chien Lee / Robber Fly (Asilidae), Wasur National Park, Indonesia

Pete Oxford / Striped robber frog (Eleutherodactylus unistrigatus) captive, Quito, Ecuador

Pete Oxford / Urdaneta robber frog (Pristimantis orestes) captive, Podocarpus National Park, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi) captive, Podocarpus National Park, Andes, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi) captive, Podocarpus National Park, Andes, Ecuador

Bernard Castelein / Robber fly (Asilidae) portrait on grass stem, Brasschaat, Belgium, July

Bernard Castelein / Robber fly (Asilidae) portrait on grass stem, Brasschaat, Belgium, July

Charlie Summers / Robber /Coconut Crab (Birgus latro) stripping a coconut of the outer shell, constantly guarding its work from other crabs. Chirstmas Island in the Indian Ocean. This is the worlds largest living land...

Charlie Summers / Robber / Coconut Crab (Birgus latro) feeding on coconut flesh, Christmas Island, Australia, Indian Ocean, November. Sequence 3/3

Charlie Summers / Robber / Coconut Crab (Birgus latro) holding coconut with husk removed, Christmas Island, Australia, Indian Ocean, November. Sequence 2/3

Charlie Summers / Robber / Coconut Crab (Birgus latro) opening a green coconut, Christmas Island, Australia, Indian Ocean, November. Sequence 1/3

Charlie Summers / Robber Crab (Birgus latro) with two coconuts, and beginning to open the first, Christmas Island, Australia in the Indian Ocean

James Christensen / Robber Fly (Asilidae) mimics Bees (Eulaema sp), Mindo, Ecuador

James Christensen / Robber Fly (Asilidae) mimics Bees (Eulaema sp), Mindo, Ecuador

Stephen Dalton / Small yellow legged robber fly (Dioctria linearis) with prey, UK

Stephen Dalton / Robber fly (Asilidae) UK

Pete Oxford / Urdaneta Robber Frog (Eleutherodactylus orestes), Podocarpus National Park, Ecuador

Pete Oxford / Urdaneta Robber Frog (Eleutherodactylus orestes), Podocarpus National Park, Ecuador

Pete Oxford / Urdaneta Robber Frog (Pristimantis orestes), Podocarpus National Park, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi), Podocarpus National Park, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi), Podocarpus National Park, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi), Podocarpus National Park, Ecuador

Pete Oxford / Espada's Robber Frog (Pristimantis galdi), Podocarpus National Park, Ecuador

James Christensen / Robber Fly (Asilidae) with prey, Mindo, Ecuador

James Christensen / Robber Fly (Asilidae) with beetle as prey, Mindo, Ecuador

Murray Cooper / Robber Fly (Asilidae) flying, Amazon, Ecuador

Paul Harcourt Davies / Hornet robber fly (Asilus crabroniformis) on dung, Italy

Stephen Dalton / Robber fly (Asilidae) in flight. UK

Andy Sands / Robber fly (Neoitamus cyanurus) resting on dead wood, Hertfordshire, England, UK

James Christensen / Fitzinger's Robber Frog (Craugastor fitzingeri), Colon, Panama

James Christensen / Fitzinger's Robber Frog (Craugastor fitzingeri), Colon, Panama

James Christensen / Wandering Spider (Phoneutria boliviensis) consuming a Fort Randolph Robber Frog (Pristimantis gaigei), Colon, Panama

Thomas Marent / Rain Frog (Eleutherodactylus sp), Colon, Colombia

Thomas Marent / Zurucuchu Robber Frog (Pristimantis w-nigrum), Colon, Colombia

James Christensen / Fitzinger's Robber Frog (Craugastor fitzingeri), western slope of the Andes Cloud Forest, Mindo, Ecuador

James Christensen / Fitzinger's Robber Frog (Craugastor fitzingeri) pair in amplexus, western slope of the Andes Cloud Forest, Mindo, Ecuador

Kevin Schafer / Caribbean Tree Frog (Eleutherodactylus coqui) on bromeliad, El Yunque Forest, Puerto Rico

Andy Sands / Hornet Robber fly (Asilus crabroniformis) mating pair, Oxfordshire, England, UK

Andy Sands / Hornet Robber fly (Asilus crabroniformis) cleaning wings with back legs, Oxfordshire, England, UK

Andy Sands / Hornet Robber fly (Asilus crabroniformis) poised ready to take flight, Oxfordshire, England, UK

John Cancalosi / Robber fly (Asilidae, probably Efferia spp) Arizona, USA

John Cancalosi / Robber fly (Asilidae, probably Efferia spp) Arizona, USA

John Cancalosi / Robber fly (Asilidae, probably Efferia spp) Arizona, USA

John Cancalosi / Robber fly (Asilidae, probably Efferia spp) mating pair, Arizona, USA

Hanne & Jens Eriksen / Robber fly {Asilidae} pair mating, Oman

Hanne & Jens Eriksen / Robber fly {Asilidae} pair mating, Oman

Andy Sands / Robber Fly (Neoitamus cyanurus) feeding on small fly, Epping Forest, Essex, England, UK

Phil Savoie / Sacken's bee hunter {Laphria sackeni} mimics a bee and preys on them, USA

Philippe Clement / Robber fly (Pogonioefferia nemoralis) portrait on rock. Arizona, USA

Rolf Nussbaumer / Robber Fly {Asilidae} adult with prey, Rio Grande Valley, Texas, USA, June 2006

Bernard Castelein / Robberfly (Neoitamus cyanaurus) Belgium

Jose B. Ruiz / Robber flies {Asilus capraeniformis} mating pair, Spain

Hans Christoph Kappel / Robber fly (Asilidae) with Damselfly prey. France

Mark Moffett / Robber Fly (Asilidae) close up, side view portrait, Panama

Mark Moffett / Rain Frog (Eleutherodactylus sp) portrait on leaf