Yes, it has a lot to do with development. Because when they are born, they are so small, almost the size of a bean, and they sort of wriggle and crawl until they get into the pouch and lock onto a teet.
We raised a very young kangaroo once, he was pretty small, and was rejected by his mother. We nursed him and when he was big enough we nailed a sugar bag to a fence post and the joey would use that as his pouch.
He never went far from our house, until he matured, then he must have thought about all those girl kangaroos he was missing out on......we seen him less and less then, until finally he just went away.
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