Lex Fridman Podcast

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#489 – Paul Rosolie: Uncontacted Tribes in the Amazon Jungle

Explore episode Jan 13, 2026
Science
Catching a 20-Foot Anaconda

#489 – Paul Rosolie: Uncontacted Tribes in the Amazon Jungle · Jan 13, 2026 Science

Rosolie and ten team members struggled to measure a just-under-20-foot green anaconda named Millie — and she barely noticed. One flex of her body sent a line of people flying sideways. He has now caught over 90 anacondas, and at this scale they are pure Leviathan: apex, unhurried, and capable of crushing a human into 'goop' if they choose.

Where this was said

Giant anaconda

At 2:08:52 · chapter starts 2:08:43

The anaconda segment begins with an Instagram post that went viral — Snoop Dogg shared it — and Rosolie explaining why it's simultaneously insane and arguably the safest giant-snake interaction possible. At apex size, female green anacondas are unbothered rather than defensive: their recurved teeth make biting costly to them, they prefer to flee, and the truly large individuals move with an almost geological unhurriedness. But 'Millie,' just under 20 feet, still flexed once during measurement and sent ten people airborne in two directions. Rosolie is clear: without JJ available to unwrap her, this interaction would be fatal. He reflects on his 90+ anaconda catches and the handful of 20-to-26-foot specimens he's encountered in the Floating Forest — a region believed to harbor potentially much larger individuals. The segment closes on the profound mechanical reality of what constriction actually does: your shoulders get folded, and then six feet-thick coils of steel-cable muscle systematically collapse everything.

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