Elephants are mammals, and the largest land animals alive today. The elephants gestation period is 22 months, the longest of any land animal. At birth it is common for an elephant calf to weigh 265 lbs. An elephant may live as long as 70 years, sometimes longer.
Edwin J. Houston, The Elements of Physical Geography, for the use of Schools, Academies, and Colleges. (Philadelphia: Eldredge & Brother, 1891) 134