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.
Female elephants experience a 22-month gestation period. Jupiterimages/liquidlibrary/Getty Images. How often an elephant mates depends on the gender. Male, or bull, elephants must enter into a condition called musth before breeding.A female elephant who is not pregnant or caring for a calf goes through an annual estrus cycle.lephants copulate many times over a few days. The bull stays with the cow for several days after breeding, mainly to ensure that no other bulls mate with her. If the cow becomes pregnant, she'll give birth approximately two years later. She joins a female herd to give birth, which she does standing up.