Argentina, while the male provided preys for both and briefly incubated when the female went out of the nest. After hatching, the female does all of the chick covering, feeding and defense were only carried out by the female, whereas the male provided prey. These are typical parental behaviors by raptors and eagles, but seem somewhat more rigidly divided in this species as the male never appears to take on brooding responsibilities in the black-and-chestnut eagle. Black-and-chestnut eagle hunts primarily in the canopy; soars frequently and is rarely seen perched. Powerful legs and talons specialized for taking large prey. They frequently have much-abraded tails by plunging after prey through the branches. Main prey is usually small-to-mid-sized arboreal mammals including red-tailed squirrels (Sciurus granatensis), opossums (Didelphis sp.), and stump-tailed porcupines (Coendou rufescens). Occasionally, carnivorans such as kinkajous (Potos flavus), coatis (Nasuella olivacea & Nasua nasua) are taken as well as monkeys such as gray-bellied night monkeys (Aotus lemurinus), tufted capuchin (Sapajus apella), and even woolly monkeys (Lagothrix lagothricha). Birds are import prey in some regions, mainly guans such as Andean guans (Penelope montagnii) and Sickle-winged Guans (Chamaepetes goudotii), though smaller birds such as Band-tailed pigeons (Patagioenas fasciata) are also taken. Black-and-chestnut eagles sometimes hunt chickens, including standard-sized adults, which has caused some persecution of this endangered species. One small dietary study was conducted in Colombia, however, found that chickens made up 14.7% while wild Andean guans were much more frequently taken, making up 53.9% of the diet. Also, here the black-and-chestnut eagles took about the same number of western mountain coatis as they did chickens, and coatis are known predators of poultry chicks and eggs. They overlap in range with several other large forest eagles, including other Spizaetus eagles, but few interactions have been reported and, as they often occur at slightly different altitudes than other neotropic forest eagles, the black-and-chestnut eagle is believed to be normally the top avian predator in its range. One exception is the similarly sized solitary eagle, which preliminary reports suggests mostly hunts snakes, whereas the black-and-chestnut eagle seems to prefer birds and small-to-mid-sized mammals, and the two species were observed flying near each other without aggression in southeastern Peru since prey partitioning appears to allow them to co-exist. One species seen to be aggressively displaced by the black-and-chestnut eagles here was the turkey vulture, possibly because they sometimes steal eggs from bird's nests. Habitat and