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The spring peeper (''Pseudacris crucifer'')〔ITIS (''Pseudacris crucifer'' ) (Integrated Taxonomic Information System). www.itis.gov.〕 is a small chorus frog widespread throughout the eastern USA and Canada. They are so called because of their chirping call that marks the beginning of spring. There are two subspecies: * The northern, ''P. c. crucifer'', found all over the eastern USA and eastern Canada. * The southern, ''P. c. bartramiana''. The southern is distinguished by a strong dark marking on its belly. ''P. c. bartramiana'' is found along the southern Gulf Coast from southeastern Texas to northern Florida and southern Georgia. ==Anatomy and physiology== Spring peepers are tan or brown with a dark cross that roughly forms an X on their dorsa (thus the Latin name ''crucifer'', meaning cross-bearer〔http://www.etymonline.com/index.php?search=crucifer&searchmode=none〕), though sometimes the marking may be indistinct.〔(【引用サイトリンク】title=Spring Peeper Profile )〕 They have a body length between less than to 〔 and a weight between .〔 The species has large toe pads for climbing, although it is more at home amid the loose debris of the forest floor.〔 The color variations of the ''P. crucifer'' are mostly tan, brown, olive green, and gray. Females are lighter-colored, while males are slightly smaller and usually have dark throats. Located by its throat, this frog has a vocal sac which expands and deflates like a balloon to create a short and distinct peeping sound. Only males have the ability to make this loud high-pitched noise, and they use it to attract mates. Spring peeper-Florida.jpg|Spring peeper, adult, Florida Spring peeper.jpg|Spring peepers are distinguished by a dark X-shaped marking on their back Pseudacris crucifer.jpg| Pseudacris crucifer01.jpg| 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spring peeper」の詳細全文を読む スポンサード リンク
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