I happened to be watching "Primal Survivor" on the "Discovery Channel" last night and as the main character was traveling across South America, he spent the night in a small village. While there he went Chachalaca hunting with two young boys one of which missed one of the birds with a rock, but the other boy killed one using a sling shot. In answer to the question of if they are edible, the boy's mother added it "to the pot" for the family's night meal.
Mike