Mark Moffett / Slug Caterpillar (Setora fletcheri) shows warning coloration and spines loaded with toxins that erect when the animal is disturbed, Tam Dao National Park, Vietnam

Paul Williams / Nephila pilipes spider and common tiger butterfly (Danaus genutia). The butterfly contains toxins that make it distateful to the spider, so the spider snips the butterfly out of its web and releases i...

Constantinos Petrinos / Marine flatworm (Pseudobiceros flowersi) with ruffled marginal tentacles - pseudotentacles. Lembeh Strait, North Sulawesi, Indonesia.e shown that fish will spit them out after the briefest of nips. We...

Adrian Davies / Blue-Green Algae (Cyanobacteria) bloom on Slapton Ley, Devon, England. This bacteria produces toxins including Micocystin, July, 2014.

Adrian Davies / Blue-Green Algae (Cyanobacteria) bloom on Slapton Ley, Devon, England. This bacteria produces toxins including Micocystin, July, 2014.

Adrian Davies / Blue-Green Algae (Cyanobacteria) bloom on Slapton Ley, Devon, England. This bacteria produces toxins including Micocystin, July.

Adrian Davies / Blue-Green Algae (Cyanobacteria) bloom on Slapton Ley, Devon, England. This bacteria produces toxins including Micocystin, July.

Piotr Naskrecki / Blister Beetle (Mylabris sp) with aposematic coloration to warn predators of its toxins, Goegap Nature Reserve, Northern Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about their toxins, Kwazulu Natal, South Africa

Thomas Marent / Cane Toad (Bufo marinus) the large swollen parotid glands behind the head of the cane produce a mixture of fourteen different toxins affecting the nervous system of any predator inexperienced enough t...

Piotr Naskrecki / Milkweed Grasshopper (Phymateus morbillosus) with aposematic coloration to warn predators of its toxins, Cederberg, Western Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about toxins, Karoo National Park, Western Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about toxins, Karoo National Park, Western Cape, South Africa

Nick Gordon / Group of Matis hunters using poison arrow frog to annoint their arrows for hunting, facial decorations mimic jaguar, Amazonia, Brazil

Nick Gordon / Matis Indians using poisonous toxin from captured Poison arrow frog (Dendrobates sp) to tip their hunting arrows, Amazonia, Brazil

Nick Gordon / Matis hunter using poison arrow frog to annoint arrow head for hunting; facial decorations mimic jaguar, Amazonia, Brazil

Piotr Naskrecki / Cane Toad (Bufo marinus) the large swollen parotid glands behind the head of the cane produce a mixture of fourteen different toxins affecting the nervous system of any predator inexperienced enough t...

Mark Moffett / Slug Caterpillar (Setora fletcheri) spines loaded with toxins are erect when the animal is disturbed, Tam Dao National Park, Vietnam, sequence 2 of 2

Mark Moffett / Slug Caterpillar (Setora fletcheri) shows warning coloration and spines loaded with toxins that erect when the animal is disturbed, Tam Dao National Park, Vietnam

Mark Moffett / Slug Caterpillar (Setora fletcheri) spines loaded with toxins are retracted when the animal is undisturbed, Tam Dao National Park, Vietnam, sequence 1 of 2

Steven David Miller / Close-up of barb from Atlantic stingray {Dasyatis sabina}. The barb is 1 inch long, with serrrations that imbed into the skin & release toxins

Miles Barton / Zanzibar red colobus monkey (Procolobus kirkii) feeding on charcoal to counter plant toxins, Zanzibar, Tanzania

Miles Barton / Zanzibar red colobus monkey (Procolobus kirkii) feeding on charcoal to counter plant toxins, Zanzibar, Tanzania

Miles Barton / Zanzibar red colobus monkey (Procolobus kirkii) feeding on charcoal to counter plant toxins, Zanzibar, Tanzania

David Hall / Smooth Trunkfish (Lactophrys triqueter), with hard protective shell of fused scale secreting toxins, Dominica, Eastern Caribbean.