Showing posts with label Genus Psaltriparus. Show all posts
Showing posts with label Genus Psaltriparus. Show all posts

Friday, April 13, 2012

>>Genus Psaltriparus >Psaltriparus minimus (Bushtit)

Bushtit


Bushtit
A Bushtit in Seattle, Washington, USA.
Conservation status
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Aegithalidae
Genus:Psaltriparus
Bonaparte, 1850
Species:P. minimus
Binomial name
Psaltriparus minimus
(Townsend, 1837)
The Bushtit (Psaltriparus minimus) is a long-tailed tit found in North America. It is the only species in the family found in the New World, and the only member of the genus Psaltriparus.
The Bushtit inhabits mixed open woodlands, often containing oaks and a scrubby chaparralunderstory ; it also inhabits parks and gardens. It is a year-round resident of the western United States and highland parts of Mexico, ranging from Vancouver through the Great Basin and the lowlands and foothills of California to southern Mexico and Guatemala.

The elaborate pendant nest of moss and ichen assembled with spider silk and lined with feathers hangs from a branch.
The Bushtit is one of the smallest passerines in North America, at 11 cm in length and 5.3 g in weight. It is gray-brown overall, with a large head, a short neck, a long tail, and a short stubby bill. The male has dark eyes and the adult female, yellow.
The Bushtit is active and gregarious, foraging for small insects and spiders in mixed-species feeding flocks containing species such as chickadees andwarblers, of 10 to over 40 individuals. Members of the group constantly make contact calls to each other that can be described as a short tsit.
As the "plain" Bushtit form lacks major identifying markings, it is often identified by their shape, calls, and behaviors.

Black-eared Bushtit

The "Black-eared" Bushtit was formerly considered a separate species (P. melanotis). It can be identified by its dark ear patch (the auricular). Thispolymorphism does not occur in the northern part of the Bushtits' range, but is first noted near the Mexican border, primarily in Texas. Most individuals with the black ear patch in that area are juvenile males, and none are adult females – some have only one or two dark lines on the face instead of a complete patch. The Black-eared form becomes more common southward in the northeastern (but not the northwestern) highlands of Mexico until from central Mexico south, all males have a complete black ear patch and even adult females have a black arc over the eye and usually a black line through the eye.

Wednesday, April 11, 2012

>>>>Aegithalidae

Aegithalidae
Long-tailed tits
Long-tailed Tit Aegithalos caudatus
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Suborder:Passeri
Family:Aegithalidae
Reichenbach, 1850
Genera
Aegithalos Hermann 1804
Psaltriparus Townsend, 1837
Psaltria Temminck 1836
Leptopoecile Severtsov, 1873
The long-tailed tits or bushtits, Aegithalidae, are a family of small passerine birds. The family contains 13 species in four genera.

Distribution and habitat

All the Aegithalidae are forest birds, particularly forest edge and understory habitats. The species in the genus Aegithalos prefer deciduous or mixed deciduous forests, while the tiny Pygmy Tit is found mostly in montane coniferous forest. The Bushtit is found in a wide range of habitats, including on occasion sagebrush and other arid shrublands, but is most common in mixed woodland. Most species in this family live in mountainous habitats in and around theHimalayas, and all are distributed in Eurasia except the Bushtit, which is native to western North America. The Long-tailed Tit has the most widespread distribution of any species of Aegithalidae, occurring across Eurasia from Britain to Japan. Two species in contrast have tiny distributions, the Burmese Tit, which is entirely restricted to two mountains in Burma, and the Pygmy Tit, which is restricted to the mountains of western Java. The species in this family are generally not migratory, although the Long-tailed Tit is prone to dispersing in the northern edges of its range (particularly in Siberia). Many mountainous species move to lower ground during the winter.

Description


In the non-breeding season Bushtit pairs join into large flocks
They are small birds, measuring 9–14 cm (3.5–5.5 in) in length, including the relatively long tail, and weighing just 4.5–9 g (0.16–0.32 oz). Theirplumage is typically dull grey or brown, although some species have white markings and the Long-tailed Tit has some pinkish colour In contrast to the rest of the family the two Leptopoecile tit-warblers are quite brightly coloured, having violet and blue plumage. The Crested Tit-warbler is the only member of the family to have a crest. The bills in this family are tiny, short and conical in shape. The wings are short and rounded and the legs are relatively long.
They are omnivorous, primarily eating insects and other invertebrates. Plant material is taken occasionally during the winter. The family generally forages in arboreally, usually in the shrub layer or canopy, and seldom visits the ground. Prey is generally glean from branches, leaves and buds, more rarely is it taken in the air. While foraging this agile family may hang upside down on branches (although this behaviour is not thought to occur in the tit-warblers) and even manipulate branches and leaves in order to locate hidden food.
Birds in this family live in flocks of 6 to 12 for a large part of the year. They maintain contact with "churring" calls; their songs are quiet.
The family generally has a monogamous breeding system. Pairs may be aided by helpers, where a related individual (or more than one) helps the established pair raise the young. While this has only been recorded in two species, this probably reflects a lack of information. Aegithalids make domed, bag-like, nests of woven cobwebs and lichen, which they line with feathers. They make the nests in trees with thick foliage, making them difficult for predators to find. The clutch comprises 6 to 10 white eggs, which in many of the species have red speckles. Adults incubate the eggs for 13 to 14 days; young stay in the nest for 16 to 17 days. At least in the two well-studied species (the Long-tailed Tit and the Bushtit), it is likely that only the female incubates.Young chicks are fed exclusively on insects and spiders.

Classification


In contrast to most of the family theWhite-browed Tit-warbler has brightly coloured plumage
The Pygmy Tit is placed in this family because it moves around in flocks and its nests resemble the long-tailed tits', but information about it is so scanty that the placement is only provisional. TheBurmese Tit is sometimes treated as conspecific with the Black-browed Tit.
There are 13 species in 4 genera.
Aegithalos
  • White-necklaced Tit Aegithalos fuliginosus
  • Silver-throated Tit Aegithalos glaucogularis
  • Rufous-fronted Tit Aegithalos iouschistos
  • Black-browed Tit Aegithalos bonvaloti
  • Burmese Tit Aegithalos sharpei
  • White-cheeked Tit Aegithalos leucogenys
  • White-throated Tit Aegithalos niveogularis
  • Long-tailed Tit Aegithalos caudatus
  • Black-throated Tit Aegithalos concinnus
Psaltriparus
  • Bushtit, Psaltriparus minimus
Psaltria
  • Pygmy Tit, Psaltria exilis
Leptopoecile
  • White-browed Tit-warbler Leptopoecile sophiae
  • Crested Tit-warbler Leptopoecile elegans