These noisy, social parrots nest and roost in colonies located in sandstone cliffs or canyons (6). Very little is known about the breeding ecology of the Lear's macaw but breeding occurs from February to April and pairs appear to defend nests within sandstone cliff faces (6). From a small number of observations the average clutch size is two young (5).
Individuals leave the roosting site at dawn to forage in palm groves (6); their diet is principally composed of the hard nuts of the licuri palm, Syagrus coronata (6). Macaws can eat around 350 nuts in one day, using their massive beak to crack open the hard shells (5). They will also forage on crops when these are available (7).