Rainbow Lorikeets are mostly monogamous and remain paired for long periods, if not for life. They reach sexual maturity after two years. Most pairs will lay one or two eggs; the female incubates the eggs for 23 days and is fed by the male in the morning and evening.
Their eponymous markings are particularly striking: a dark blue head and stomach, a bright green back, tail and vent, and a red breast and beak. Juveniles can be identified by their black beaks which over the next year gradually brighten to orange.