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 Gestation period of a donkey (how long she is pregnant) is 12 months (give or take some, we have reports of 13 1/2 months). When the foal is born, it will be on it's feet within the first hour.lease do not buy a jack and jennet foal pair to raise together and have babies for fun-it will be 3-4 years before you have breeding age donkeys, and the two will need separate facilities. There are books available to help you!