

Rebecca Tarvin
Biologist and toxicologist from the University of California who explains epibatidine, its natural source in Ecuadorian frogs, and its effects—appearing as an expert interviewee in the Navalny segment.
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Feb 15, 2026 • 26min
Russia 'used frog toxin' to kill Alexei Navalny
Rebecca Tarvin, a biologist and toxicologist, explains epibatidine from Ecuadorian dart frogs. Kaya Callas, an EU foreign policy official, discusses transatlantic responses and defence burdens. Sergei Guriev, an economist and critic of the Russian government, analyzes the poisoning and broader Russian actions. They focus on the toxin’s origin and effects, plausibility of synthetic use, and international political reactions.


