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Ahana Fernandez trekked through the rainforests of Central America, ears tuned for high-pitched, repetitive chirping and squeaking from greater sac-winged bat pups. Their babbling may shed light on why human babies babble and the origins of speech.

On the genetic level, we're not all that different from chimps. But those small differences in DNA can have huge effects.

Being able to cooperate and form strong relationships is often essential to species survival, and it's seen when we examine the evolutionary success of our human ancestors, apes, and even our dogs.

More than ten million years ago, the world was brimming with a wide variety of apes. New studies of ape fossils provide clues how humans evolved.