Allosaurus was a large, carnivorous dinosaur that lived during the Late Jurassic period, around 150 million years ago. It walked on two legs, had a massive skull with sharp teeth, and three-fingered hands equipped with large claws—making it one of the top predators of its time. Fossils suggest it may have hunted large herbivores like stegosaurs or even scavenged when the opportunity arose. Allosaurus is one of the most well-known theropods, often considered a predecessor to later giants like Tyrannosaurus rex.