The black-billed Amazon feeds on fruit, seeds, nuts, berries and blossoms high in the forest canopy (2) (3). Populations of black-billed Amazons will move in response to the location of food sources (3). This species will also feed on cultivated crops, and can cause considerable damage to ripening fruit (7).
The black-billed Amazon forms flocks of 6 to 30 individuals (8) (9). This species nests in tree-hollows at least 18 metres above the ground. Like other parrot species, vigorous vocalizing between black-billed Amazon pairs advertise nesting territories (5).
The breeding season is from March to August. The black-billed Amazon lays between two and four eggs, with an interval of approximately 48 hours between successive eggs. The eggs are incubated solely by the female for 24 days. During this time the male will forage and exchange food with the female. Incubation starts after the first egg is laid, so hatching occurs at intervals, with up to seven days between the first and last hatching (5). The black-billed Amazon chicks spend up to eight weeks in the nest before fledging (3) (5).
The Jamaican boa (Epicrates subflavus) is the main predator to the black-billed Amazon, and is the main cause of mortality in chicks during the long nesting period (5).