The chicks at the Wildlife Conservation Society's Queens Zoo are part of the largest flock of thick-billed parrots in the United States.
Zoo director Scott Silver says the baby birds are a major win in the fight to save the rare species, which was eliminated from the American Southwest by the mid-20th century.
The red-and-green parrot is native to Mexico and critically endangered elsewhere - its population decimated by hunting and logging.
Since 2006, the Queens Zoo has successfully raised a total of 15 thick-billed parrot chicks. The six latest chicks were born from three different sets of parents, since July.