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Agkistrodon bilineatus : ウィキペディア英語版 | Agkistrodon bilineatus
:''Common names: cantil, Mexican cantil, Mexican ground pit viper,〔Gloyd HK, Conant R. 1990. ''Snakes of the Agkistrodon Complex: A Monographic Review''. Society for the Study of Amphibians and Reptiles. 614 pp. 52 plates. LCCN 89-50342. ISBN 0-916984-20-6.〕 Cantil viper,〔Mehrtens JM. 1987. ''Living Snakes of the World in Color''. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.〕 black moccasin,〔Campbell JA, Lamar WW. 2004. ''The Venomous Reptiles of the Western Hemisphere''. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.〕 Mexican moccasin,〔 more.'' ''Agkistrodon bilineatus'' is a venomous pitviper species found in Mexico and Central America as far south as Costa Rica.〔 Four subspecies are currently recognized, including the nominate subspecies described here. ==Description== These are heavy-bodied snakes, and share the same general body structure with cottonmouths. They average around in length and have a broad, triangular-shaped head with small eyes that have vertical pupils. Coloration can vary, but most are brown or black, with darker brown or black banding, sometimes with white or cream-colored accents. ''A. taylori'' is known for being more elaborately patterned, often having distinct tan-colored banding, sometimes with orange or yellow accents that can almost appear gold in color. There are the following distinctive yellow and/or white lines on the head: a vertical line on the rostral and mental, a fine line on the canthus continuing above and beyond the eye to the neck, a broader line on the upper lip from the anterior nasal to the last labial.〔Boulenger, G.A. 1896. ''Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the...Viperidæ''. Trustees of the British Museum (Natural History). London. xiv + 727 pp. + Plates I.-XXV. (''Ancistrodon bilineatus'', pp. 521–522.)〕 Juveniles are almost always distinctly banded, with bright green or yellow tail tips, which they use to lure prey. As they age, their pattern and coloration fade and darken.
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