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Aegithalidae
The bushtits or long-tailed tits,〔Gill, F., Wright, M. & Donsker, D. (2008). IOC World Bird Names (version 1.6). Available at http://www.worldbirdnames.org/〕 Aegithalidae, are a family of small, drab passerine birds with moderately long tails. The family contains 11 species in four genera, all but one of which are found in Eurasia. Bushtits are active birds, moving almost constantly while they forage for insects in shrubs and trees. During non-breeding season, birds live in flocks of up to 50 individuals.〔 Several bushtit species display cooperative breeding behavior, also called helpers at the nest.〔Li, J., Lv, L., Wang, Y., Xi, B., & Zhang, Z. (2012). Breeding biology of two sympatric Aegithalos tits with helpers at the nest. Journal of Ornithology, 153(2), 273-283.〕
== 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 the Himalayas, and all are distributed in Eurasia except the American 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 bushtit, which is entirely restricted to two mountains in Burma, and the pygmy bushtit, 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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