Image of the Day: Hoo’s That?
Lar gibbons (Hylobates lar) produce different soft “hoo” calls to greet neighbors, sing duets with their mates, and warn each other about various predators.
ESTHER CLARKE
(See “Context-specific close-range ‘hoo’ calls in wild gibbons (Hylobates lar),” BMC Evolutionary Biology, 2015.)
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