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Our hominid ancestors were much smaller than we were and were easily preyed upon by big cats and big birds.

"Hominin" is a newer term that describes a subdivision of the larger category known as hominids.

While brown bears don’t eat humans, they still kill about twice as many hominids as the North American black bear, mostly in protection of their cubs.

The authors add, "In wild chimpanzees, the intricacies of tool use learning continue into adulthood. This pattern supports ideas that large brains across hominids allow continued learning through the first two decades of life."

Her search through sediment from various levels of the Ranis excavation turned up DNA from a broad array of mammals, but none from hominids.