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Coluber constrictor flaviventris
''Coluber constrictor flaviventris'', commonly known as the eastern yellowbelly racer, is a subspecies of racer, a nonvenomous, colubrid snake. It is endemic to North America.〔Integrated Taxonomic Information Sysyem (ITIS). www.itis.gov.〕
==Description==
The eastern yellowbelly racer is a thin-bodied snake, capable of attaining a total length of 1.5 metres (60 inches). As an adult, its color is an olive grey-green, with a yellow underside. As a juvenile it is remarkably different, having a tan or cream-colored body with brown or grey blotches. The color gradually changes as the snake ages, becoming solid olive grey-green. Authors disagree as to when this transformation is complete, from 1½ to three years old, and from 18 to 30 inches (46-76 cm) in total length.〔Wright, A.H., & A.A. Wright. 1957. ''Handbook of Snakes of the United States and Canada''. Comstock. Ithaca & London. 1,105 pp. (in 2 volumes) (''Coluber constrictor flaviventris'', pp. 138-142, Figure 44., Map 16.)〕
==Geographic range==
The eastern yellowbelly racer is found in the United States, from the states of Montana, North Dakota, east to Iowa and south to Texas, and southwest to Louisiana. It is also found in isolated populations in Canada.〔Conant, R. 1975. ''A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition''. Houghton Mifflin. Boston. 429 pp. ISBN 0-395-19977-8 (paperback). (''Coluber constrictor flaviventris'', pp. 179-180 + Plate 26 + Map 139.)〕
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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