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I believe new world monkeys are speculated to have crossed over about 40 million years ago - whereas humans are closer to 40,000 years ago. I think the northern

I believe new world monkeys are speculated to have crossed over about 40 million years ago - whereas humans are closer to 40,000 years ago. I think the northern boundary is just because there is a giant desert, though I admit it is still surprising to me.

dhosek 2y ago
And yet monkeys and apes managed to move past the Arabian desert to move as far east as Japan and across the Sahara into Morocco and elsewhere in North Africa. (While looking to see what the range of old world primates was, I discovered that there are marsupials in Papua New Guinea including something called a Tree Kangaroo.)