Usually, a bird’s gender is unknown to other species of beings; it is a well kept secret for the bird itself and its kind. When nature created the birds, it never took into consideration the human specie and the knowledge that this last one needs.
In some birds, the gender can be identified by the individual’s colors, wither completely, or, in some cases, only when they reach maturity. The eclectus male for instance is green, while the female is red. At maturity, the nasal area (cere) of a parakeet male is blue and the female’s one is brow. However, there are still many species of birds that don’t have different colors depending on the gender.