The average age varies greatly by species. 46 was the longest age  of a snake in captivity at the Philadelphia Zoo. The average age of  North American Snakes will live aboutâ¦ 18-20 years in captivity.
4) Pregnancy. Pregnancy is another of the common causes of swollen feet and ankles. There are three reasons for this: a) the excess weight gained puts more pressure on the legs and feet. b) the expanding uterus can place pressure on the blood vessels for the legs and. c) pregnancy hormones cause the body to retain fluids.
Other possible causes for foot, leg, and ankle swelling include certain medical conditions or body changes, such as: Natural hormonal changes: Fluctuating levels of estrogen and progesterone can cause reduced circulation in the legs, resulting in swelling.