El zorzal de Bicknell ( Catharus bicknelli) es conocido por su rareza… y por su promiscuidad. A diferencia de la mayoría de las aves canoras, la hembra establece un territorio y luego se aparea con los machos que pasan por él. Después pone huevos que fueron fecundados por distintos machos…

The Bicknell’s Thrush is known for scarcity… and promiscuity. Unlike most songbirds, the female thrush establishes a territory and then mates with males that happen by. She then lays eggs that have been fertilized by multiple different males. Many of those males will stick around and help…

Most of the time, a Ruby-crowned Kinglet is neither ruby nor regal. A tiny songbird washed in faded olive-green, the male shows a hint of crimson atop of his head — hardly a ruby crown. But don’t forsake the kinglet for flashier birds. When courting a female or dueling with another male…

Incluso en invierno, algunas aves, como el carbonero de gorra negra, los pinzones comunes y los zorzales americanos, saludan el amanecer con su canto. Normalmente escuchamos el coro del amanecer en primavera, cuando las aves cantan para marcar territorio y atraer parejas. Pero las aves no…

Before we see or feel spring, we often hear it first — in the testimony of a Red-winged Blackbird, the energy of a Song Sparrow, or the serenade of an American Robin. But across much of North America, an earlier sign of spring is the return of Turkey Vultures. In the U.S., you may see them…

Most duck species court and form pair bonds in winter. In the icy waters of Vermont’s Lake Champlain, Common Goldeneyes are getting hot! This male is displaying his signature move, the “head-throw-kick,” to attract a mate. Goldeneye pairs now bonding throughout the US will migrate in early…

By winter, most warblers have migrated south. But the Yellow-rumped Warbler, which birders affectionately call “butterbutt” is a lesson in adaptation, notes Bryan Pfeiffer, a writer, naturalist, and educator who lives in Vermont. “In winter, when most of their kin are enjoying insects in…

Even in winter, some birds — including Black-capped Chickadees, House Finches, and American Robins — greet the sunrise with song. We normally hear the dawn chorus in springtime, when birds sing to define territory and attract mates. But birds don’t breed by warmth alone. Day length is a…

In the grips of winter, when most songbirds are months away from the breeding season, crossbills are already warming up. It’s all about the food. When the evergreens hang heavy with snow and cones, crossbills can get all the calories they need for the demands of reproduction: courtship…

It’s basic black with an inelegant voice. It nests in places we rarely visit. And in relative obscurity, the Rusty Blackbird has suffered one of the most dramatic population declines ever recorded among our songbirds. Loss of swamps in the southeastern US, where they winter, probably…