A new study of the species Alouatta caraya has revealed that the deeper the vocalization, the smaller the testicals. This also led to the conclusions that howler monkeys with low-pitch vocalization tended to live in single-male groups.
A new study of the species Alouatta caraya has revealed that the deeper the vocalization, the smaller the testicals. This also led to the conclusions that howler monkeys with low-pitch vocalization tended to live in single-male groups.
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