Square Feet. The square foot is a unit of area used in the imperial and U.S. customary measurement systems. A square measurement is the two-dimensional derivative of a linear measure, so a square foot is defined as the area of a square with sides 1 ft in length.
http://wiki.answers.com/Q/How_long_is_a_black_rhino_pregnant_for. A Black Rhino is pregnant usually between 419 and 478 days, or 15 to 16 months. The mother will give birth to a single calf, weighing in on average 35 to 50 kg, (about 80 pounds). The calf will stay with it's mother anywhere from 2 to 3 yea...
I wonder if a donkey ever just up and forgot she was even pregnant since the whole process takes so long. 16. Giraffe. The average giraffe pregnancy takes 15 months. Humans can get pregnant, have a baby, and then get pregnant again in that same amount of time. Whoa. 17. Alpaca