Ingo Arndt / Puss Moth (Cerura vinula) on stem, Europe

Ingo Arndt / Cecropia Moth (Hyalophora cecropia) caterpillar, close up of head

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

Piotr Naskrecki / Cup Moth (Phobetron sp) caterpillar, Suriname

Ingo Arndt / Saddleback Moth (Sibine horrida) caterpillars with poisonous spines, Costa Rica

Ingo Arndt / Saddleback Moth (Sibine horrida) caterpillars with poisonous spines, Costa Rica

Piotr Naskrecki / Cup Moth (Limacodidae) caterpillar, Ghana

Pete Oxford / Ello Sphinx Moth (Erinnyis ello) on mangrove, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Ello Sphinx Moth (Erinnyis ello) caterpillar on mangrove sprout, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

James Christensen / Saturniid Moth (Leucanella sp) caterpillar with poisonous spines, Mindo, Ecuador

Murray Cooper / Saddleback Moth (Sibine stimulea) caterpillar, Ecuador

Murray Cooper / Cup Moth (Limacodidae) caterpillar, Ecuador