The fossil wasoriginally discoveredin 1988 by a 12-year-old boy in Oceanside, California, near San Diego.
Machaeroidines are the oldest known sabre-toothed mammalian carnivores.
They have long been extinct, and scientists have very little information on them.
Machaeroidines are an early example of the hypercarnivore, an animal with a diet of over 70% meat.
Today, hypercarnivores are common; polar bears and tigers are two well-known species.
And if you have a pet cat, there’s a hypercarnivore living with you in your home.
