The smartest animals, and why the ranking keeps changing
Intelligence in animals is not one thing. Here are the species that top each measure of it, and why most of them are threatened.
4 stories in this category.
Intelligence in animals is not one thing. Here are the species that top each measure of it, and why most of them are threatened.
Four kinds of great ape, six species, and every one is Endangered or worse. Humans are the seventh, and the only one not in trouble.
Rainforests cover under 2% of the Earth's surface and hold about half its land species. Here are 22 of them, by forest, and what each one does that nothing else does.
Ten species closest to disappearing, what each one does that nothing else does, and the organizations working on them right now.