Canada to Mexico, east to Kansas.
Prairies to 9,000 feet.
Greenish-yellow or olive with large rounded blotches on the body.
Mainly diurnal. Less irritable than the Diamondback. Moves considerable distances in search of food. Often found near, and hibernates in, marmot or prairie dog holes. They often live in great numbers in the northern part of their range.
Average of 12 young. In northern part of range, development of young is so slow that they are carried for a year longer than in the south where gestation is only months.
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This animal is not currently in the Zoo\\\'s collection.