Thomas Marent / Splendid Poison Dart Frog (Dendrobates sylvaticus) in rainforest, Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis) in rainforest, Timbiqui, Colombia

Paul Bertner / Caterpillar with aposematic coloration, Gunung Leuser National Park, Sumatra, Indonesia

Chien Lee / Harlequin Poison Dart Frog (Dendrobates histrionicus), Utria National Park, Colombia

Chien Lee / Ecuador Poison Frog (Epipedobates bilinguis), El Coca, Ecuador

Chien Lee / Condoto Stubfoot Toad (Atelopus spurrelli), Utria National Park, Colombia

Chien Lee / Red-headed Krait (Bungarus flaviceps) in rainforest, Santubong National Park, Sarawak, Borneo, Malaysia

Chien Lee / Golden Mantella (Mantella aurantiaca) in forest, Andasibe, Madagascar

Chien Lee / Golden Mantella (Mantella aurantiaca), Andasibe, Madagascar

Paul Bertner / Spiny Spider (Gasteracantha falcicornis), Udzungwa Mountains National Park, Tanzania

Hiroya Minakuchi / Jellyfish (Spirocodon saltator), Japan

Chien Lee / Red Stink Bug (Pycanum rubeus) hatchlings cluster to amplify the effect of their aposematic warning coloration, Malaysia

Roland Seitre / Vicente's Poison Frog (Dendrobates vicentei), native to Panama

Roland Seitre / Harlequin Poison Dart Frog (Dendrobates histrionicus) in defensive posture, native to South America

Piotr Naskrecki / Fulgorid Planthopper (Fulgoridae) spreading wings to show aposematic coloration, Costa Rica

Piotr Naskrecki / Tessaratomid (Tessaratomidae) nymph with warning coloration, Papua New Guinea

Piotr Naskrecki / Looper Moth (Geometridae) caterpillar with aposematic coloration, Atewa Range, Ghana

Hiroya Minakuchi / Nudibranch (Hypselodoris bullockii) pair mating, Borneo, Malaysia

Thomas Marent / Dyeing Poison Frog (Dendrobates tinctorius), Kaw, French Guiana

Thomas Marent / Alpine Newt (Ichthyosaura alpestris) male, Switzerland

Thomas Marent / Alpine Newt (Ichthyosaura alpestris) male, Switzerland

Thomas Marent / Alpine Newt (Ichthyosaura alpestris) female, Switzerland

Piotr Naskrecki / Grasshopper with aposematic coloration aerates toxic blood as a defensive behavior, Kwazulu Natal, South Africa

Piotr Naskrecki / Grasshopper with aposematic coloration, Maloti Mountains, Lesotho, South Africa

Piotr Naskrecki / Milkweed Grasshopper (Phymateus morbillosus) member of the Foam grasshopper family has aposematic coloration, South Africa

Jen Guyton / Caterpillar (Megalopygidae) captive in a butterfly house in Monteverde, Costa Rica. This caterpillar shows aposematic, or warning coloration.

Constantinos Petrinos / Blue-Ringed Octopus or Blue Ringed Octopus (Hapalochlaena lunulata) displaying during daytime. This species, when flashing (pulsating) its blue rings, is a classic example of aposematic or warning co...

Constantinos Petrinos / Blue-Ringed Octopus or Blue Ringed Octopus (Hapalochlaena lunulata) displaying while walking over the seabed during daytime. This species, when flashing (pulsating) its blue rings, is a classic exampl...

Constantinos Petrinos / Blue-Ringed Octopus (Hapalochlaena lunulata) jetting away, swimming away while flashing (pulsating) its blue rings. This species, when flashing (pulsating) its blue rings, is a classic example of apos...

Constantinos Petrinos / Blue-Ringed Octopus or Blue Ringed Octopus (Hapalochlaena lunulata) displaying while hunting during daytime. This species, when flashing (pulsating) its blue rings, is a classic example of aposematic...

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) adult female. After laying her eggs inside a coconut shell, the female is leaves the arear jetting away for a short distance while displaying its vibrant war...

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) adult female. After laying her eggs inside a coconut shell, the female is leaves the arear jetting away for a short distance while displaying its vibrant war...

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) walking on sea floor, with aposematic coloration. This species has a small cuttlebone so can only float for short periods of time, so walks on the sea floor....

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) walking on sea floor, with aposematic coloration. This species has a small cuttlebone so can only float for short periods of time, so walks on the sea floor....

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) walking on sea floor, with aposematic coloration. This species has a small cuttlebone so can only float for short periods of time, so walks on the sea floor....

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) walking on sea floor, with aposematic coloration. This species has a small cuttlebone so can only float for short periods of time, so walks on the sea floor....

Constantinos Petrinos / Flamboyant cuttlefish (Metasepia pfefferi) walking on sea floor, with aposematic coloration. This species has a small cuttlebone so can only float for short periods of time, so walks on the sea floor....

Russell Cooper / Cinnabar Moth Caterpillar (Tyria jacobaeae) feeding on Ragwort (Senecio jacobaea) flower buds. Showing Black and Yellow (Aposematic) warning colouration.Morden, South London. UK

Steve Gettle / Strawberry Poison Dart Frog (Oophaga pumilio) pair, Costa Rica

Steve Gettle / Strawberry Poison Dart Frog (Oophaga pumilio) in cavity, Costa Rica

Paul Bertner / Leafhopper (Cicadellidae) nymph, Tambopata Research Center, Peru

Thomas Marent / Flag-footed Bug (Anisocelis flavolineata), Tatama National Park, Colombia

Thomas Marent / Splendid Poison Dart Frog (Dendrobates sylvaticus), Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis), Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis) in rainforest, Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis) in rainforest, Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis), Timbiqui, Colombia

Thomas Marent / Santander Poison Frog (Andinobates virolinensis), Santander, Colombia