Chaco chachalacas forage in forests, looking for plant matter such as fruits, seeds and flowers. They also eat caterpillars which can be very abundant in certain years. They are good seed dispersers because the fruit seeds are defecated intact. Seeds eaten by the chachalaca have a higher germination rate than normal seeds.
Chaco Chachalaca usually forages in groups of up to 30 birds. They feed at the top of trees, but they come sometimes to the ground or close if the undergrowth is not too thick.
Courtship consists of males displaying their red throat while strutting and calling to attract females. The female incubates 3 to 4 eggs for about 24 days, while the male remains nearby for protection. This species is declining due to the birds being hunted or kept as pets. Their habitat is also subject to destruction due to fires, overgrazing, and wood extraction.