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...
View. comments. Elephants are notorious for their long memories, but now they will be renowned for their lengthy pregnancies. Long-suffering Asian elephant Azizah was carrying her baby for 700 days - 84 longer than the average-and finally gave birth at ZSL Whipsnade Zoo, Bedfordshire, last Tuesday. It is believed to be the longest pregnancy ever recorded at the British zoo-nearly two extra months over the normal gestation period of 22 months. And the baby, at just 16 stone (104kg) at birth, is the smallest in Whipshade's history. Scroll down to watch the baby elephants playing at Whipsnade Zoo this week.