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...
The elephant's gestation period is 22 months, the longest of any land animal. The gestation period for an African elephant averages 640 days; for the Asian elephant it is 645 â¦ days. The mother gives birth to a calf that weighs up to 115 kg and stands over 75 cm tall.For more details, please see sites listed below.he elephant has a gestation period of about 22 months, the longest of any animal. Gestation period (lenghth of pregnancy) for elephants is 22 months. (to be correct, they do not stay in their mothers stomachs, that would mean the mother had eaten them!