, an iconic African megaherbivore for which little is known about social communication, uses vocal recognition to manage relationships between territorial groups.
“We found that the vocalizations of a stranger individual induced a stronger behavioral response than those produced by individuals from either the same or a neighboring group,” said, a researcher with the Equipe de Neuro-Ethologie Sensorielle ENES/CRNL at the University of Saint-Etienne and the Institut Universitaire de France.
First, they recorded calls representative of each hippo group. They then played the recordings back to all the other hippos to see how they’d react to the calls of their own group versus another group from the same lake or a more distant group .
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