{{Taxobox
| name = Dark-sided Flycatcher
| image = 
| image_width = 
| image_caption = 
| status = LC
| regnum = Animalia
| phylum = Chordata
| classis = Aves
| ordo = Passeriformes
| familia = Muscicapidae
| genus = '' Muscicapa ''
| species = '''''M. sibirica'''''
| binomial = ''Muscicapa sibirica''
| binomial_authority = Gmelin, 1789
}}
The '''Dark-sided Flycatcher''' (''Muscicapa sibirica'') is a small passerine bird belonging to the genus ''Muscicapa'' in the Old World flycatcher family Muscicapidae. It has a wide distribution in Asia with northern birds migrating south for the winter. It is also known as the '''Siberian Flycatcher''' or '''Sooty Flycatcher''', the latter name is also used for the Sooty Flycatcher (''M. infuscata'') of Africa.

==Description==
It is 13 to 14 cm long. The upperparts are plain and dark grey-brown apart from a pale wingbar and pale edging to the tertial feathers. The breast and flanks have a variable amount of streaky dark grey-brown. This is unlike the similar Asian Brown Flycatcher which has rather plain pale underparts and the Grey-streaked Flycatcher which is white below with distinct grey streaks. 

Dark-sided Flycatchers have a pale submoustachial stripe and a dark malar stripe which outlines the white throat and half-collar. The centre of the lower breast and belly is white while the undertail-coverts are white with dark centres to the feathers. The bill is short and dark and the feet are black. The eye is large and has a whitish ring around it. The wings are long with a longer primary projection than the Asian Brown Flycatcher.

The adults of both sexes are alike but juveniles have pale spots on the upperparts, a mottled breast and buff tips to the wing-coverts.

The song is a series of thin, high-pitched notes with trills and whistles. The call is a metallic tinkling.

==Distribution==
The subspecies ''M. s. sibirica'' breeds in south-east Siberia westward to beyond Lake Baikal as well as in Mongolia, north-east China, North Korea and Japan (Hokkaidō and northern Honshū). ''M. s. rothschildi'' breeds in western China and Myanmar. ''M. s. gulmergi'' occurs from Afghanistan to Kashmir with ''M. s. cacabata'' from the eastern Himalayas to south-east Tibet and perhaps Myanmar.

The wintering range includes north-east Vagrant birds have been recorded in Alaska and Bermuda.

It inhabits coniferous and mixed forest and woodland and is sometimes seen in plantations, parks and gardens. It typically occurs in mountainous regions, reaching 4000 metres above sea-level in some areas.

==Behaviour==
Like other flycatchers, its feeding technique is to perch on an exposed branch and wait. When an insect flies past, the bird dashes out to snatch it.

{{生物分類表
|省略 = 鳥綱
|名称 = サメビタキ
|<!-- 画像=250px|サメビタキ
|画像キャプション = '''サメビタキ''' ''Muscicapa sibirica'' -->
|status = LC
|目 = Passeriformes
|亜目 = Oscines
|科 = Muscicapidae
|属 = ''Muscicapa''
|種 = '''サメビタキ''' ''M. sibirica''
|学名 = ''Muscicapa sibirica''<br />Gmelin, 1776
|和名 = サメビタキ
|英名 = Dark-sided flycatcher<br />Siberian flycatcher<br />Sooty flycatcher
}}
'''サメビタキ'''（''Muscicapa sibirica''）は、動物界脊索動物門鳥綱スズメ目ヒタキ科サメビタキ属に分類される鳥。

== 分布 ==
種小名''sibirica''は「シベリアの」の意。

アフガニスタン、インド北部、インドネシア、カザフスタン、カンボジア、シンガポール、タイ王国、大韓民国、中華人民共和国、朝鮮民主主義人民共和国、日本、ネパール、パキスタン、バングラデシュ、フィリピン、ブルネイ、ベトナム、マレーシア、ミャンマー、ラオス、ロシア東部

夏季にアフガニスタン、ロシア（カムチャツカ半島、シベリア等）東部、ヒマラヤ山脈等で繁殖し、冬季はユーラシア大陸南部、インドネシア、フィリピンへ南下し越冬する。日本では基亜種が夏季に北海道、本州中部以北で繁殖する（夏鳥）。本州西部以南では渡りの途中に飛来する（旅鳥）。

== 形態 ==
全長13.5cm。体重12.5-17.5g。背面は灰褐色、腹面は白い体羽で覆われる。胸部に薄褐色の縦縞が入る。

== 亜種 ==
4亜種に分かれるとされる。
* ''Muscicapa sibirica sibirica''　Gmelin, 1789　サメビタキ - 等

== 生態 ==
群れは形成せず、単独もしくはペアで生活する。