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There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [17] Larger mammals are more likely to produce a well-developed neonate than small mammals. Large mammals develop at an absolute slower rate compared to small mammals.
For most species, the amount a fetus grows before birth determines the length of the gestation period. 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]
Birthing predominantly occurs after the rainy season, with newborn fawns weighing 2 to 3 kg (4.4 to 6.6 lb). [26] They give birth twice yearly with one or two fawns. [18] When giving birth, a female gazelle crouches as the newborn fawn drops to the ground, tearing the umbilical cord. [27]
Females are monoestrous and after delayed implantation usually give birth the following June, after a 10-month gestation period, typically to two spotted fawns of opposite sexes. The fawns remain hidden in long grass from predators; they are suckled by their mother several times a day for around three months.
These facts about kittens will help you become an expert on one of the world's cutest and cuddliest baby animals.
Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
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Females usually bear within a few days of each other. [20] Twin fawns are common. [32] Newborn pronghorns weigh 2–4 kg (4–9 lb), most commonly 3 kg (7 lb). In their first 21–26 days, fawns spend time hiding in vegetation. [46] Fawns interact with their mothers for 20–25 minutes a day; this continues even when the fawn joins a nursery. [46]