Editing Trogon (section)

==Morphology and flight==
[[Image:Scarlet-rumped Trogon (Harpactes duvaucelii) - pair.jpg|thumb|A pair of [[scarlet-rumped trogon]]s, showing [[sexual dimorphism]] in the plumage. The female is on the left, male on the right.]]
The trogons as a family are fairly uniform in appearance, having compact bodies and long tails (very long in the case of the quetzals), and short necks. Trogons range in size from the {{cvt|23|cm}}, {{cvt|40|g}} [[scarlet-rumped trogon]] to the {{cvt|40|cm}}, {{cvt|210|g}} [[resplendent quetzal]] (not including the male quetzal's {{convert|3|ft|m|adj=mid|-long}} tail streamers). Their legs and feet are weak and short, and trogons are essentially unable to walk beyond a very occasional shuffle along a branch. They are even incapable of turning around on a branch without using their wings. The ratio of leg muscle to body weight in trogons is only 3%, the lowest known ratio of any bird. The arrangement of toes on the feet of trogons is also unique among birds, although essentially resembling the zygodactyl's two forward two backward arrangement of parrots and other near-passerines, the actual toes are arranged with usually inner hallux being the outer hind toe, an arrangement that is referred to as [[Dactyly#Heterodactyly|heterodactylous]]. The strong bill is short and the gape wide, particularly in the fruit eating quetzals, with a slight hook at the end. There is also a notch at the end of the bill and many species have slight serrations in the mandibles. The skin is exceptionally tender, making preparation of [[bird collections|study skins]] difficult for museum curators. The skeletons of trogons are surprisingly slender, particularly the skulls which are very thin. The [[plumage]] of many species is iridescent, although not in most of the Asian species. The African trogons are generally green on the back with red bellies. The New World trogons similarly have green or deep blue upperparts but are more varied in their lowerparts. The Asian species tend towards red underparts and brown backs.
[[File:TrogonSkull.jpg|thumb|left|Skull of a trogon showing the presence of a [[wikt:basipterygoid|basipterygoid]] process (bpg.p.) and a [[wikt:schizognathous|schizognathous]] palate]]
The wings are short but strong, with the wing muscle ratio being around 22% of the body weight. In spite of the strength of their [[bird flight|flight]], trogons do not fly often or for great distances, generally flying no more than a few hundred metres at a time. Only the montane species tend to make long-distance flights. Shorter flights tend to be direct and swift, but longer flights are slightly undulating. Their flight can be surprisingly silent (for observers), although that of a few species is reportedly quite noisy.

===Calls===
The [[bird vocalization|calls]] of trogons are generally loud and uncomplex, consisting of monosyllabic hoots and whistles delivered in varying patterns and sequences.<ref name ="HBW"/> The calls of the quetzals and the two Caribbean genera are the most complex. Among the Asian genera the [[Sumatra]]n trogon (''Apalharpactes'') has the most atypical call of any trogon, research has not yet established whether the closely related Javan trogon has a similar call.<ref name ="Collar 2002"/> The calls of the other Asian genus, ''Harpactes'', are remarkably uniform. In addition to the territorial and breeding calls given by males and females during the breeding seasons, trogons have been recorded as having aggression calls given by competing males and alarm calls.