These seeds are extremely energy rich and are equivalent to the caloric content of animal tissue. Therefore, no alternate food source is necessary. Reproduction Breeding for Budgerigars can occur during any time of the year but most frequently occur with an abundance of seed. Most grass seeding occurs during the winter in northern Australia and during the spring and summer in southern Australia. This means Budgerigars also breed after heavy rains because grass growth is dependant upon water.
Budgerigars are monogamous and breed in large colonies throughout their range.
There has been some record of extra-pair copulations, probably so the female can receive extra help raising the clutch. The female chooses the nest site and incubates while the male spends most of the time foraging and feeding all until the chicks are ready to fledge. The parents often have several broods in succession. Budgerigars make their nest in pre-existing cavities that are available in fence posts, logs, and Eucalyptus trees. Several nests can be found on the same tree branch measuring only 3-5 m apart from one another.