Their babies get mumps and measles. Each monkey species has a unique dialect and social structure. They do not cross breed. They either are swingers or climbers. All swingers have thumbs low on their hands so the thumbs won't get caught easily.
All climbers have thumbs high on their hands to go over branches more easily.
All monkeys have tails while all apes and humans do not. We saw an abundance of amazing primates including vervets, lemurs, tamarins and marmosets. But there will still be plenty to see on our next visit. There is a gibbon from South East Asia and many local vervet monkeys, displaced by land development. All to soon, our safari was over - we had lost track of time.