Ridge-nosed Rattlesnake
Crotalus willardi
Sunnyside Canyon, Huachuca Mts., Arizona. 02 Sept. 2012.
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From Wikipedia:
A rather small rattlesnake with all subspecies measuring 30–60 cm in length.
Color patterns are generally a dark brown base with pale or white horizontal striping,
but vary slightly between subspecies. The distinctive ridges along each side of its nose,
which are a series of upturned scales, are unique to its species and are the origin of its name.