In the green tree canopies of forested areas in Myanmar, you might wake up to the sounds of gibbons singing love songs. Gibbons start their day with passionate duets and, though these love songs may sound a little different than the ones in your playlists, they just helped researchers figure out that Myanmar has the largest population of an endangered gibbon species on Earth. They're called skywalker gibbons, and until recently, scientists thought there were fewer than 200 of them – all living in southwestern China.

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Researchers found that chimpanzees and bonobos were able to recognize photos of former groupmates after more than 25 years apart, according to a new study from Johns Hopkins University.

On average, half the participants in a study by the University of St. Andrews in Scotland could recognize what either chimpanzees or bonobos were communicating.