White-tipped Quetzal

Identificazione

Elegante trogone di grandi dimensioni con coda nera con punta bianca inferiormente, e privo di cresta. Ha parti superiori e petto verdi con sfumature dorate e ventre rosso brillante; il becco è giallo. La femmina ha un becco grigio, petto inferiore grigio-marrone e sottocoda barrato di bianco con punte bianche. Nessuna sovrapposizione con altre specie di quetzal, e più grande di altri trogoni nel suo areale. Abbastanza comune in alte foreste nebulose mature, spesso da solo o in coppia ma a volte in gruppi su alberi da frutto. Si posa a livelli medi o alti nella foresta. Il canto è una serie forte e malinconica di "WHOOOou hoo hoou"; il richiamo è simile a quello del Falco di foresta barrato.

Tassonomia

Nome scientifico

Pharomachrus fulgidus

Autorità

(Gould, 1838)

Ordine

Trogoniformes

Famiglia

Trogonidi

Genere

Pharomachrus

Areale e habitat

The white-tipped quetzal can be found in Colombia, Venezuela and Guyana and the species is endemic to the northern South America. In Colombia and Venezuela they appear in upper tropical and subtropical zones. The white-tipped quetzal occurs in a wide variety of habitats from subtropical to temperate forests, cloud forests, secondary growth, forest edges, moist ravines and coffee plantations. Like the golden-headed and crested quetzals, they are cloud forest birds. They are rarer in Guyana, however they have been seen inhabiting the most dense areas in the barrancas (deep ravines) of forests. Due to the lack of observations on the white-tipped quetzal, it is unknown why they favour these environments, however it is likely due to the temperate, humid conditions, the availability of berries and the ability to find small crevices in these areas to nest in.

Migrazione

Resident species

Comportamento

The specific behavioural habits of the white-tipped quetzal have not been studied in detail. However, it is presumed that they partake in the general behavioural patterns of the trogon family. The white-tipped quetzal is a fast flyer, but reluctant to fly long distances. Trogons are generally non-migratory. Some species undertake partial local movements, however it is presumed that the white-tipped quetzal is a sedentary species.Trogons are usually inactive outside of intermittent feeding flights. They find food by the most commonly used technique for Trogons, which is a sally-glean flight where a trogon flies from a perch to its target on a branch or within foliage. Once it has arrived at its target the bird hovers and then grabs the item before returning to its original perch to consume the seed or berry.It has been noted that although the White-tipped quetzal is striking and beautiful, it has few to no further engaging qualities. This lack of activity is presumably a defence against predation, likely to compensate for their famous bright feathers. Trogons have been observed moving from branch to branch, keeping their brightly coloured feathers sheltered from potential observers while also keeping watch using their flexible necks, which can turn through 180 degrees. These anti-predatory techniques provide an effective camouflage within their natural wooded habitats. Breeding predominantly occurs towards the end of the dry season, between January and April. It is thought that the quetzal's reproductive cycle is directly correlated with fruit availability. Reproductive activities including courtship, nesting and chick rearing occur when fruits are most abundant in the forest conditions. This aids the species during energy-demanding phases of their life which may increase the probability of successful reproduction.White-tipped quetzal nests are usually located in isolated, non-native trees, sometimes in previous holes of woodpeckers and often in dead tree trunks 4–10m above the ground. Nests have been observed in an old cavity, excavated by a Woodpecker, in a dead snag, approximately 5 m above the ground at an elevation of 1600 m. They can also nest in termite nests, laying 2–4 white or pastel-coloured eggs and there were subtle differences in egg color and size. First breeding is usually at one to two years of age. The altricial young hatch naked, quickly molting into their immature plumage without a significant downy stage. This fast, naked-to-feathered progression may be an ancestral characteristic or a result of nesting in cavities where the temperature is constant and down is not needed for temperature regulation. The species fledges in around three weeks and obtains adult plumage after their second prebasic molt.There is little data on the survival rates and competition of the white-tipped quetzal however its IUCN status suggests that the population is stable.

Conservazione

Tendenza della popolazione

declining