This is an Elegant Crested Tinamou. Tinamous are closely related to birds like ostriches, emus, cassowaries, moas, elephant birds, and kiwis. But, even though none of those birds can fly, tinamous can.
Elegant Crested Tinamous are native to South America. They feed on seeds, leaves, insects and fruit. They are the only tinamous that live in flocks. They prefer to live in open areas.
I saw this bird at the Reptiles and Birds building at the Brookfield Zoo.