Some were the size of a dog. Others were as large as polar bears. A newly-discovered fossil of the ferocious hyaenodont is helping scientists understand a little bit more about the mysterious creatures.

About 30 million years ago, parts of Egypt were covered in lush forests. Within those trees, lurked an order of fearsome big cat-sized carnivores called Hyaenodonta. These apex predators thrived after the dinosaurs went extinct, but would eventually meet their own untimely end.

Scientists in Egypt discovered a not-before-known apex predator that lived 30 million years ago, potentially helping to solve an extinction mystery.

A rare discovery of a nearly complete skull in the Egyptian desert has led scientists to the "dream" revelation of a new 30-million-year-old species of the ancient apex predatory carnivore, Hyaenodonta.

A nearly complete skull of a leopard-sized carnivore was discovered in the Egyptian desert. Anastasiia Riddle. More Videos. Toronto crash passenger recounts when Delta plane flipp

A nearly complete skull fossil found in Egypt has revealed a new species of Hyaenodonta, an apex carnivore that mysteriously went extinct about 25 million years ago.

Buried beneath the sun-scorched sands of Egypt’s Fayum Depression, a place where ancient forests once flourished, scientists have unearthed the skull of a fearsome predator that ruled the land 30 million years ago.

Paleontologists have made an extraordinary discovery in one of Africa’s most important fossil sites, unearthing a new ancient carnivore species known as the Bastetodon. During a recent excavation in the Egyptian desert,