Instructions
Look at the coloring and style of the plumage. Certain birds such as cardinals and parrots are dimorphic: meaning they have physical characteristics that help you determine their gender. Male dimorphic birds tend to have brighter and bolder plumage, which stands out from his female counterpart.
Pay attention to the bird's behavioral patterns. Some birds will behave in a certain way to hint at its gender. Male birds will sing and dance in front of his mate. Male birds also tend to be more aggressive than female birds. A female bird is more likely to take over the nesting.
Research the bird in question to find out its breed and go from there. Certain birds provide characteristics similar to male or female birds. This will include finding out if the bird is dimorphic or monomorphic, where they do not show traits that prove its gender. For instance, the male cockatoo is often larger than the female cockatoo.
Have testing done on the birds to determine the gender. Laboratory testing includes having a chromosomal analysis done, hormonal testing or DNA testing.
How to Tell the Differences Between a Girl & Boy Bird
Unlike many other animals, birds do not often have characteristics to distinguish between the genders, such as genitalia with cats and dogs. With birds, you will have to pay close attention to other characteristics or have a laboratory run tests to determine which gender they are. This information is pertinent when you want to mate two birds or are just curious about birds you have as pets or that frequently visit your yard.