What is the northern white-cheeked gibbon? Though they might look a bit like monkeys, northern white-cheeked gibbons are officially classified as apes. One easy way to tell the difference is that ...
A male southern yellow-cheeked crested gibbon. Male and female crested gibbons differ in appearance: males sport black coats whereas females are buff or golden. Image by Rhett A. Butler / Mongabay.
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