The primary way to tell a budgie's gender is by looking at the color of the cere, which is located just above the bird's beak. Knowing the approximate age of your budgie can also help in determining gender. For budgies younger than eight months, it can be tricky because their ceres can still change to another color. Different varieties of budgies may also have different color ceres. There are ways, however, to help you identify the gender of your budgie.
Look at the color of your budgie's cere. A male budgie's cere can be bright or purplish-blue. Male budgies generally have a cere that is more prominent in size and color. For the male recessive pied, albino, dark-eyed clear, lacewing, and fallow varieties, the cere will be bright violet or pink, according to The Budgie Place.
A female budgie will have a white, light blue, tan, brownish, or pink cere. Your budgie is female if her cere is brown with a rough and flaky texture. You can often tell a female budgie by this flaky texture when she is young.
Watch your budgie. A budgie's behavior can also help you determine gender. Young female budgies are more aggressive than young males. Males are generally more outgoing than females. Males are more active than females and will also bob their heads when singing or playing. Female budgies will be more bossy and "snitty" than males, reports The Budgie Place.
Listen to your budgie. Male budgies will sing more than females. Female budgies also make noises that sound as if they are mad; males can make this sound but will only do so when they are singing.
For budgies less than eight months old, determining gender is more difficult as the cere can change colors before the budgie is a year old. Colors can appear to be changing one way and then change again before the bird reaches maturity. If your budgie begins to develop a brown, flaky appearance before maturity, you can be certain it is female, according to The Budgie Place. Female budgies bite harder than male budgies, according to Let's Talk Birds.