Final answer:
New World monkeys and Old World monkeys differ in sexual dimorphism, pair bonding, and tail characteristics.
Step-by-step explanation:
3 Anatomical Differences Between New World and Old World Monkeys
1. Sexual dimorphism: Old World monkeys tend to have significant size differences between males and females, with males being more than twice as heavy as females. New World monkeys, on the other hand, do not show a significant size difference between the sexes.
2. Pair bonding: New World monkeys form pair bonds, where a mating pair cooperatively raises young. They do not show a significant size difference between the sexes. Old World monkeys, on the other hand, do not tend to form monogamous relationships.
3. Tails and seats: New World monkeys have prehensile or grasping tails, while Old World monkeys have non-prehensile tails. Additionally, some Old World monkeys have ischial callosities, thickened patches of skin on their seats.