Surprisingly, however, the crimson rosella is its own worst enemy. During the breeding season, it is common for females to fly to other nests and destroy the eggs and in fact, this is the most common cause for an egg failing to hatch. This behaviour is thought to be a function of competition for suitable nesting hollows, since a nest will be abandoned if all the eggs in it are destroyed, and a pair of rosellas will tend to nest in the same area from year to year.