The Black-tailed rattlesnakes mate in the spring, once they have mated the male stays with the female to stop other males from mating with her. It is in the summer that the female gives birth to her young, the young stay with their mother for around a day or two before leaving by their selves. A female usually mates every year and has 10-12 young at a time. They live for around 15–20 years.= = = YMCA = = =
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