Pájaro Moscón Baloncito

Identificación

The verdin is a very small bird. At 4.5 in (11 cm) in length, it rivals the American bushtit as one of the smallest passerines in North America. It is gray overall, and adults have a bright yellow head and rufous shoulder patch (the lesser coverts). Unlike the tits, it has a sharply pointed bill. Juveniles have a light gray body without the rufous shoulder patch and yellow head. The base of the short bill is thick by the head, and draws to a sharp point at the tip.<p>Little is known about geographic or individual variation in vocalizations. Verdins produce a variety of calls, loud for their size. The typical call note is a repetitive "tschep" sound repeated in rapid staccato. In Texas, rapid "chip-chip-chip" calls have been observed, all at the same pitch and at the same speed in each call series.” The day of hatching, nestlings can produce short peep notes, faint and high-pitched. Fledglings, during their post-juvenile molt, can make soft warbling notes, similar to more complex signatures of adult calls. The verdin gives rapid "tschep" calls frequently while foraging. Unmated males sound "tseet" calls repeatedly in early spring, which may function to attract females. "Tseet" calls are also given by either sex of a mated pair, by solitary foraging birds, and by older nestlings. This may be used as an identifier call to help keep members of the breeding pair together as they move through brush to forage. "Tweedle" warbling calls may reinforce a breeding pair bond. The verdin also gives a "gee-gee-gee-gee" alarm call in response to predators or when captured.

Taxonomía

The verdin was formally described in 1850 by the Swedish zoologist Carl Jakob Sundevall under the binomial name Aegithalus flaviceps. It is now the only species placed in the genus Auriparus that was introduced in 1864 by the American naturalist Spencer Fullerton Baird. The genus name combines the Latin aurum, auri meaning "gold" with the genus name Parus that was introduced by Carl Linnaeus in 1758 for the tits. The specific epithet flaviceps combines the Latin flavis meaning "yellow" with -ceps meaning "-capped".<p>Six subspecies are recognised:

Nombre científico

Auriparus flaviceps

Autoridad

(Sundevall, 1850)

Orden

Passeriformes

Familia

Remizidae

Género

Auriparus

Distribución y hábitat

Two subspecies nest in the United States. The subspecies A. f. acaciarum is resident from southern California, Nevada, and Utah southward into Mexico; it is associated mostly with the Sonoran Desert. The subspecies A. f. ornatus is found from New Mexico and Oklahoma southward into Mexico and is associated with the Chihuahuan Desert and its scrublands. The remaining 4-5 subspecies are resident to Mexico, and aren't known to migrate into the United States. Verdins nest in shrubs and thorny thickets with few trees. Their nests are best described as spherical masses of bulky twigs and branches that are then lined with grasses, feathers, and hair. The entrance to the nest is about 1" in diameter, and is usually at the bottom of the sphere. They feed in shrub-land and scrubby outcrops where insects are hosted and berries and seeds are plentiful.

Migración

Especie residente

Comportamiento

Patrón migratorio: Especie residente.

Conservación

Tendencia poblacional: en declive.

Tendencia poblacional

en declive