Also known as black-hooded parakeets, nanday conures (Nandayus nenday) begin to reproduce when they are about 1 year old. Male and female nanday conures look strikingly similar, with green bodies, shimmery aqua "scarves" around their necks, orange feathers on their legs and under their tails, and black hoods extending over the eyes. Observe minute details to tell this bird's gender.
If you have two conures and are not sure of their genders, a male/female pair likely will begin breeding behavior when they are between 1 and 3 years old. The male and female will sound and behave in a similar fashion, so you won't have a clue until you see the female sitting on the nest. The male usually remains close by the nest to guard it but does not sit on the eggs or feed the young.
If you have a single conure, you will need to take it to the vet for a DNA test using a feather or excrement. On rare occasions, a mature female may lay an egg without a male present.