The breeding period of the Kookaburra is from September to January. Their eggs are about the same size as a bantam's and are pure white. The clutch size can vary from one to five eggs, but the most common numbers are two or four. The eggs are laid a day apart, and the incubation time is anywhere from 24 to 26 days. This gives the parents a break because the chicks hatch at these same intervals as well.
Kookaburras have an unusual method of parenting that many scientists find evolutionarily puzzling.
When the young are reared and fledge, they tend to stay around the nest and help out the parents with the next clutch. This is in contrast with the majority of birds whose young leave the nest in search of mates and territory. When this family system of chick rearing is in place, it is not unusual for there to be a second clutch laid in one season. In some documented cases, the auxiliary birds spend more time incubating the eggs than one of the parents. If one parent dies, very often one of the helpers steps in and takes it's place with the remaining mate.