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...
Some seal species give birth after 330 days, fairly similar to horses. Tapirs and rhinoceroses, moderately close relatives of equines, have even longer gestations. Tapirs have pregnancies of 440 days, while the African rhinoceros has a 480-day gestation. Large animals with much shorter gestation periods include tigers (103 days), reindeer (225 days), moose (240 days), and bison (270 days). Those with considerably longer pregnancies are camels (410 days) and giraffes (425 days).