Compact forest jewels whose order is still a phylogenetic puzzle
Trogonidae’s forty-nine species in seven genera—the sole Trogoniformes—haunt tropical forests worldwide, brightest in the Neotropics’ thirty-four species. Fossils reach the Early Eocene about forty-nine million years ago, yet where the order sits among birds remains famously unsettled.
Broad bills and weak legs suit insect-and-fruit canopy foraging; flight is fast but short, rarely more than a few hundred metres. African Apaloderma, Asian Harpactes and Apalharpactes, and New World genera including quetzals Pharomachrus and Euptilotis map three subfamilies. Caribbean Priotelus forms are deeply divergent; coppery-tailed trogons push into temperate North America while montane quetzals chill in cloud forest.
A Fur Formation Danish cranium near fifty-four million years ago and Messel’s mid-Eocene birds anchor the fossil history; DNA once favored an African root despite New World richness. Sizes span scarlet-rumped trogons near twenty-three centimetres and forty grams to resplendent quetzals near 210 grams with streaming tails. Wing muscles about twenty-two percent of mass power brief bursts; calls are loud simple hoots except in quetzals and Caribbean taxa.
Sedentary habits and hole-nesting tie them to intact forest. Bright ventral colors against green backs make them the tropics’ sit-and-wait jewels—seen suddenly, gone before the binoculars rise.
Hole nests in decaying trunks tie breeding success to intact older forest, so logging hits them quietly. Partial altitudinal shifts in mountains replace true long-distance migration. Loud monotonous hoots are easier to hear than the birds are to see, a field mark as reliable as the metallic green backs. Whether an African bar-tailed or a Central American quetzal, the body plan stays conservative: sit still, sally briefly, glow.
Source: Trogon
