The species name spurius, meaning illegitimate, might seem an incongruous name for a bird so elegant and beautiful - albeit slightly gaudy – as southwest WA’s endemic Red-capped Parrot Purpureicephalus spurius. The name stems from the fact that immatures are so plain as to hardly seem related to the extraordinarily vivid, though not often seen, bright adult male. The majority of birds observed lie between these extremes, with a partial or duller version of the male plumage, and one might be tempted to label these as females. However - perhaps obviously, given the extreme gender ratio this would imply - identifying the sex of adult birds is not so straightforward. In fact HANZAB  states that females are “very similar to male and often inseparable”.