The Crested Guan is, together with the Great Currasow, one of the largest arboreal birds, measuring almost one meter from head to tail. It likes to search for fruit on trees and perches on branches to eat them. It also rests on the trees, where normally it is darker and their black plumage can hide their presence. It can be observed dwelling in the ground, particularly on trails and grass plains, but it is not that common. Juveniles look just like the adult, but smaller in size and have similar habits.