Sea Giants Older Than Whales
By Radiocity Team
Published Jul 07, 2025
Megalodon
A prehistoric shark estimated to grow up to 60 feet long—larger than most whales—this apex predator ruled the oceans for millions of years.
Shastasaurus
An ichthyosaur from the Triassic period, it could reach lengths of 69 feet, making it one of the largest marine reptiles ever.
Leedsichthys
This enormous bony fish from the Jurassic seas reached up to 50 feet long—larger than a modern orca, but likely a gentle filter feeder.
Basilosaurus
Despite its name meaning “king lizard,” it was a primitive whale over 60 feet long, with an eel-like body and huge jaws.
Liopleurodon
A terrifying pliosaur with a massive skull and deadly bite, some estimates suggest it could grow up to 40 feet long.
Mosasaurus
Featured in Jurassic World, this marine lizard could exceed 50 feet, using its powerful jaws to prey on turtles, fish, and other reptiles.
Tylosaurus
A close relative of Mosasaurus, Tylosaurus could grow over 45 feet and was a fast, aggressive predator of the Late Cretaceous oceans.
Nature’s Most Surprising Creatures
