Most male marmosets are colour-blind; confusing greens, reds, browns and oranges, whereas females see in colour the same way humans do.
Twins are common and a set of twins can weigh up to 40% of the mother’s body weight. Therefore the duty of carrying the infants is shared equally between family members.
Common marmosets have special alarm calls for the different types of predators they might encounter. Knowing which predator they face enables them to decide whether to mob the predator or hide away.