insects. Remsen et al. (1993) found that the stomach contents of P. auriceps were "fruit only" 87.5% of the time and "arthropods and fruit" 12.5% of the time. The quetzal's fruit-heavy diet makes it a very important species for the dispersal of the fruits’ seeds. It is also thought that, like other quetzals, the golden-headed quetzal feeds on small vertebrates such as frogs and lizards. However, this has been brought into question by Lohnes and Greeney (2008) who found the diet of P. auriceps was much less varied since they never observed it feeding on any animal matter other than insects while observing the species for 22 days. Their observations also confirmed that the formerly accepted idea that quetzals did not feed their hatchlings fruit until ten days after hatching was untrue. Reproduction Golden-headed quetzals are usually solitary birds but, during breeding, they are seasonally monogamous. The male attracts the female by establishing a territory and advertising it by singing. Once a pair is formed they must find a suitable location for their nest and share the work of excavating it. All trogons are cavity-nesters; golden-headed quetzals specifically excavate decaying tree trunks with their beaks or modify existing hollow spots in old trees. Quetzals form shallow, more open, unlined cavities from which part of the bird (head or tail) is usually visible. It can be difficult for the quetzal to find an appropriate site for their nest since the dead tree must be soft enough for them to carve but not too rotten as to be unable to support their nest. For this reason quetzals investigate multiple trees before finding a suitable site. The copulatory behaviour of quetzals is not well known since they appear to be discreet in their mating. The golden-headed quetzal has been observed breeding once a year between the months of February and June. The female lays 1-2 pale blue eggs and then incubates them the majority of the time (18–19 days of incubation) except for one long daily incubation period undertaken by the male. Golden-headed quetzals remain in the nest for 25–30 days before fledging. They are born blind and naked, like all trogons, and it is at about 3 days before fledging that the nestling develops its final juvenile plumage appearing mostly brown and black but with visible green plumage, particularly on the nape, upper back, and throat. Brooding duties are shared equally between