The Guaiabero Bolbopsittacus lunulatus, one of the worldâs least known parrots, is confined to the Philippine islands of Luzon, Leyte, Samar, Mindanao and Panaon. Mainly green and only 15 cm in size, the males have blue lores, cheeks, orbital region and chin, and over the upper back there is a thin pale blue band. Chest, belly and undertail-coverts are yellow-green, as are the lower upperparts and uppertail-coverts. The bill is bluishgrey, blackish towards the tip. Females differ from males by having the blue limited to a small area around the lower bill, and having a small hindcollar of black feathers with a wide yellowish seam. Four subspecies have been described. The nominate form occurs on Luzon, intermedius on Samar and Leyte (this on the whole is darkerplumaged, with stronger blue and, in the female, rather broader hind-collar), and mindanensis on Mindanao and Panaon (in which the maleâs blue is restricted to the area around the lower bill and eyes). Placement of the population on Samar in its own subspecies callainipictus is increasingly discounted, since its coloration lies within the range of variation of intermedius. Geographically, too, this separation makes little sense, since Samar and Leyte are less than 3 km apart and too small for us to expect them to possess their own subspecies. The closest relatives of the Guaiabero are certainly the Australasian Psittaculirostris and Cyclopsitta, with which Bolbopsittacus shares a compact body shape, short tail, robust bill and probably also feeding habits.