Birds and other biodiversity

The tiny, bright yellow bird that John  James Audubon called “Wilson’s Flycatching Warbler” breeds in a large swath all across northern North America. Wilson’s Warblers winter in much of Central America, and so pass through most of the continent at some point during the year. Molecular studies have shown that certain breeding populations winter in…

The Horned Guan (Oreophasis derbianus) holds a near-mythical status for birders. It is large –almost the size of a turkey — and bizzare-looking, with a red horn projecting from its head, the exact function of which is unknown. It is rare, a critically endangered species with a population of  fewer than 2000 individuals. It is…

The Black-and-white Warbler (Mniotilta varia) is a small, zebra-striped bird that is unique among our warblers. It is the only representative of its genus, and also the only one whose typical mode of foraging is clinging to and climbing up…

The Rufous-capped Warbler (Basileuterus rufifrons) is found through much of Central America, north through Mexico. This species is occasionally found in the southwestern U.S., when it creates a sensation among birders. This warbler is a common resident of shade coffee…

The Wood Thrush, a relative of the familiar American Robin, is often considered a symbol of the population declines of birds that nest in North America and winter in the tropics. This species has been declining since the mid-1960s, and…

One of the most enduring memories of my visit to Finca Hartmann is that of passing a spot that was frequently visited by a vivid male Violet Sabrewing (Campylopterus hemileucurus), a large tropical hummingbird found from southern Mexico to western…

Baltimore Orioles rely on flowering trees, especially the species commonly used to provide shade to coffee, during their winter months in Latin America.