One certainty about behavior is its uncertainty. The more we know, the more we need to know. If you just looked at this picture of a male mantled howler monkey you might be tempted to draw some conclusions about his status and sexual prowess. But such may or may not be true… If you want to know what a male howler monkey sounds like, you can hear one here.
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Donald Trump must have a bit of howler monkey in his lineage.
It depends on which explanation for the difference turns out to be true. 🙂