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The high-pitched, wailing duets of Madagascar’s giant indri lemurs may sound chaotic at first, but a study shows they actually have a regular underlying timing pattern.

Our distant primate relative, the Indri indri, is a critically endangered species of lemur found only in Madagascar.

Scientists now say they have discovered one of the hallmarks of the skill in the fluffy, black-and-white indri lemur, a species distantly related to humans and only found in Madagascar.

“It seems like it’s an individual characteristic of indris that are not seen in many other mammals or even birds,” says St. Clair, who was not involved in the new study.

They found teeth marks left by silky sifakas, saw indris and collected fecal samples from the ruffed lemurs, including one from the white morph — a first for science.