Poison Dart Frog, named due it excreting a poison that paralyses - used on native arrows; Arenal, Alajuela Province, Costa Rica

Snorkeler and excrements of Sperm Whale, Physeter macrocephalus, Caribbean Sea, Dominica

Sperm Whale territorial fight, Physeter macrocephalus, Caribbean Sea, Dominica

Great White Shark, Carcharodon carcharias, Guadalupe Island, Mexico

Sperm Whale territorial fight, Physeter macrocephalus, Caribbean Sea, Dominica

Snorkeler and excrements of Sperm Whale, Physeter macrocephalus, Caribbean Sea, Dominica

Sperm Whale, Physeter macrocephalus, Caribbean Sea, Dominica

Sperm Whale, Physeter macrocephalus, Caribbean Sea, Dominica

Bumphead Parrotfish defecating, Bolbometopon muricatum, Raja Ampat, West Papua, Indonesia

An adult gentoo penguin (Pygoscelis papua) defecating on Petermann Island, Antarctica