A pod of hippos, Hippopotamus amphibius,  huddle together in the Mara River, Masai Mara, Kenya.

tuned in

Listen: Hippo back talk could help save one of the world's last huge herbivores

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Hippopotamuses are very vocal animals, although we know little about why they make so much noise.

They often call and respond to each other, like a conversation.

According to new research, hippos can even recognize their pals’ voices when they’re recorded and played by a loudspeaker.

Nicolas Mathevon