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Explore Before Crocodiles: The Giant Predators That Ruled Rivers First with 805,682 views, 3,815 likes, and 226 comments. Experience the impact of this video content that has captured audience attention.

For 270 million years, one throne has almost never sat empty — the top of the food chain in fresh water. In this video I trace five animals that held it, in order, from the Permian to the late Miocene. Not the most famous predators, but the ones that actually ruled the swamps, deltas and rivers of their time. And what surprised me most while researching this is how each of them lost that throne. Not one was beaten by something stronger. The five rulers covered here: 00:00 Cold open 01:15 Prionosuchus (~270 million years ago) — a nine-metre amphibian shaped exactly like a crocodile, hundreds of millions of years before crocodiles existed 04:45 Sarcosuchus imperator (~112 million years ago) — the "SuperCroc" of Cretaceous Africa, and why the 12-metre figure you've seen online is outdated 10:00 Spinosaurus aegyptiacus (~95 million years ago) — the swimmer-versus-wader debate, shown two ways 16:33 Titanoboa cerrejonensis (~60 million years ago) — the largest snake known, and what constriction actually does to prey 21:48 Purussaurus brasiliensis (~8 million years ago) — the strongest bite in this video, ended by a mountain range 26:17 What five extinctions have in common A few things I've tried to get right, because a lot of videos on these animals repeat numbers that have since been revised: — Sarcosuchus is not a true crocodile, and the original 2001 size estimate has been scaled down considerably by later analyses. I explain where both figures come from. — Spinosaurus is longer than Tyrannosaurus, but not necessarily heavier. Those are two different claims and they get conflated constantly. — Constricting snakes do not kill by suffocation. The mechanism is circulatory, and it's much faster than the version most of us were taught. — The "Titanoboa as a fossil thermometer" study is genuinely contested. I present both sides rather than stating it as settled. — Purussaurus is a caiman, not a crocodile. Its closest living relatives are still swimming in the Amazon today. Where the science is unresolved, I say so. Where I'm giving an opinion rather than a conclusion, I flag it. Several of the size figures here are estimates extrapolated from partial material — usually a single skull or a handful of vertebrae — and I think that's worth stating out loud rather than presenting a clean number and moving on. The Spinosaurus section is the one I'd point you to if you only watch part of this. There are two competing reconstructions of how it hunted, and rather than pick one, I've animated the same hunt twice — same river, same prey, two completely different ways to kill. I'd genuinely like to know which one you find more convincing. This took a long time to put together. If you spot something I've got wrong, or a paper I've missed, please tell me in the comments — I'd rather be corrected than repeat an error in the next one. #prehistoric #paleontology #spinosaurus #titanoboa #prehistoriclife #evolution #documentary

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