Eisenberg, John F. 1973. "Reproduction in two species of spider monkeys, Ateles fusciceps and Ateles geoffroyi." Journal of Mammalogy, 54, (4) 955–957. https://doi ...
Researchers found that New World monkeys can produce extreme yodeling-like sounds by rapidly switching between their vocal folds (for low tones) and specialized vocal membranes (for high tones), ...
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