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The estrous cycle is about 23 days and the gestation period lasts 250 to 260 days. The calves weigh about 21 kg (46 lb) at birth [ 14 ] and scramble to their feet within minutes, being able to move with the herd soon afterwards, [ 33 ] a fact on which their survival relies. [ 58 ]
At the other extreme, an early member of the order, the prehistoric horse Eohippus, had a withers height of only 30 to 60 cm (12 to 24 in). [5] Apart from dwarf varieties of the domestic horse and donkey, living perissodactyls reach a body length of 180–420 cm (71–165 in) and a weight of 150 to 4,500 kg (330 to 9,920 lb). [6]
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals , but also occurs for some non-mammals.
Smaller species normally have a shorter gestation period than larger animals. [2] For example, a cat's gestation normally takes 58–65 days while an elephant's takes nearly 2 years (21 months). [3] However, growth does not necessarily determine the length of gestation for all species, especially for those with a breeding season. Species that ...
More developed infants will typically require a longer gestation period. Altricial mammals needs less time to gestate compare to the precocial (well-developed neonate) mammal. A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20]
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The gestation period ranges from 190 to 210 days, and usually a single young is born, though twins are known to occur. [8] Mother and child taking a bath at Lisbon Zoo. The common hippopotamus gives birth and mates only in the water, but pygmy hippos mate and give birth on both land and water. Young pygmy hippos can swim almost immediately.
The Java pony is a breed of pony developed on the island of Java in Indonesia. It is thought to have descended from wild forebears of Mongolian Wild Horse ancestry. [ 1 ] It is larger and stronger than the Timor pony , with more Arabian breed influence.