Was Navalny poisoning by frog toxin meant to send a message?

Yvette Cooper may think so, and use of epibatidine may seem exotic, but experts say that is not conclusive It was a very particular choice of weapon, but experts say it remains unclear whether the dart frog toxin used to kill the Russian opposition leader Alexei Navalny was intended to convey a message. Known as epibatidine, the poison is produced by wild dart frogs native to parts of South America – meaning Navalny could not have accidentally taken the poison. Continue reading...

By Nicola Davis Science correspondent