Superb Fairy-wren males defend a territory of between 0.5 and 2 ha, and there is some evidence from radio tracking that territories are smaller in urban areas. Fairy-wrens live in family groups, with the young of previous years remaining in their parents' territory and contributing to the care of their younger siblings. Males are more likely than females to stay with their parents, and so, during the breeding season, it is common to see a brown female accompanied by several blue males. During the non-breeding season, males moult into a brown plumage, similar to the female's, except that males retain their blue tails. The black beak of males is also a good way of distinguishing them from females and juveniles, which have a chestnut-coloured beak.