It's ValentinesDay, the day we celebrate love in all its forms, from adorable tap-dancing songbirds to the extremely ... loud sex lives of howler monkeys. And check 50ShadesofBiology for more shocking love stories in nature.
Just after dawn, barbershop quartets of male howler monkeys echo over the canopy of Mexico’s forests.remembers them well from his early fieldwork in Veracruz. “Most people who don’t know what they’re listening to assume it’s a jaguar,” says Dunn, a primatologist at the University of Cambridge.
The calls serve as a warning to male competitors and an alluring pickup line for females. While studying primates in Mexico, Dunn heard drastic differences between resident howler monkeys. He and his colleagues decided to pin down the origin and evolution of this well-known variation among species.
Real pay dirt came from the National Museums of Scotland, which had preserved the remains of two howlers that had died of natural causes in zoos. CT and MRI scans of the two specimens provided a rare peek at the howler vocal system’s layout.articles, delivered to your inbox
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