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

Scientists from Germany, France, the Netherlands, Sweden and the UK performed a postmortem analysis of the Russian pro-democracy campaigner and opposition leader, who died on February 16, 2024. As Navalny died while imprisoned in Siberia,

On Saturday, five European governments said lab work on deceased Russian dissident Alexei Navalny's remains detected epibatidine, a poison associated with South American dart frogs, and they argued the finding points to Russian responsibility for his 2024 death in an Arctic prison colony.

Researchers are now equipped with additional insight into how poisonous frogs may have evolved resistance against their own toxins, thanks to the results of a new study. Neotropical poisonous frogs produce a neurotoxin called epibatidine - which attaches ...