Alpine ibex
Alpine ibex reach sexual maturity at 18 months, but females do not reach their maximum body size for five to six years, and males not for 9–11 years. The horns grow throughout life, growing most rapidly during the second year of life, and thereafter by about a year, eventually slowing to half that rate once the animal reaches 10 years of age. Alpine ibex live for up to 19 years in the wild.