The
Northern Beardless-Tyrannulet is a very small flycatcher (the smallest in
North America) of Mexico and Central America, with a range that just reaches
the United States in southern Arizona and New Mexico, and the southern tip
of Texas. It gets its name because unlike many flycatchers, it lacks
specialized bristles around the mouth that help to capture flying insects.
Perhaps because of the lack of these bristles, the Northern
Beardless-Tyrannulet may focus more on slower, more easily captured insects
than do other flycatcher species.
Habitat: Found in semi-open woodlands throughout
its range. In the United States, it favors riparian areas with
cottonwoods and willows, or mesquite stands, in its Arizona range. In
Texas, it is mostly found in open woodlands, including mesquite stands.
Diet: Feeds on insects and spiders, and may on
occasion feed on berries and seeds.
Behavior: Foraging by observing from a perch, and
flying out to capture insects in mid-air, or by briefly hovering and
gleaning insects from foliage and branches of vegetation. It will also
clamber through branches of shrubs or trees in search of insects.
Nesting: The nest of a Northern
Beardless-Tyrannulet is a small, rounded mass of grasses and weeds, with an
entrance hole on the side. The female usually lays 3 eggs. Both
parents help to feed the young when they hatch.
Song: The song of a Northern Beardless-Tyrannulet
is a descending series of clear whistles.
Migration: Considered a permanent resident
throughout most of its more tropical range, in the United States it is
mostly migratory, although small numbers may remain in winter in southern
Arizona and Texas.