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.
16 Months of Patience. The white rhino is one of the largest of all rhino species, so it's not surprising that her large stature would lead to a long gestation period of 15 to 16 months. After the gestation period, the mother gives birth to a single calf weighing around 143 pounds.
Male elephants are called bulls and females are called cows. After mating, the cow will be pregnant for around 22 months. When the baby elephant is finally born, it can weigh around 200 lbs. (91 kg) and stand about 3 feet (1 m) tall. A baby elephant is called a calf.