Poison dart frogs have fascinated researchers. Now their toxin has allegedly been linked to the death of Russian opposition leader Alexei Navalny.

LONDON (AP) — Russian opposition leader Alexei Navalny was poisoned by the Kremlin with a rare and lethal toxin found in the skin of poison dart frogs, five European countries said Saturday.

A new study uncovers a hidden online trade in amphibians that exposes regulatory gaps and threatens wild populations.

The world’s largest frog species is very aptly named – the goliath frog, also known as the giant slippery frog and goliath bullfrog. Native to Equatorial Guinea and Cameroon, it can grow up to 32cm in ...