Saurophaganax was the largest Jurassic theropod we know of, and at 10
meters in length, it was even longer and heavier than many other giant theropods. It was very similar to Allosaurus, but it was larger and had slightly different neck and tail vertebrae. It may in fact be a large species of Allosaurus.
Saurophaganax was briefly seen confronting an Allosaurus for a dead Camptosaurus. The Allosaurus stood its ground but the opponent bit its head. The Allosaurus backed down whilst the Saurophaganax enjoyed its feast.
In Planet Dinosaur's book, the information page for Allosaurus is incorrectly shown to be the Saurophaganax design, the color and model.
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