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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 ...
Large mammals which give birth to twins is much more rare, but it does occur occasionally even for mammals as large as elephants. In April 2018, approximately 8-month old elephant twins were sighted joining their mother's herd in the Tarangire National Park of Tanzania, estimated to have been born in August 2017. [9]
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 ]
After a 22-month gestation period, this mammal gives live birth to a single baby also known as a calf. Other female elephants in the herd crowd around the female as a way to protect her while she ...
Large mammals develop at an absolute slower rate compared to small mammals. Thus, the large mammal tend have longer gestation periods than small mammal as they tend to produce larger neonate. [18] Large mammals require a longer period of time to attain any proportion of adult mass compared to small mammals. [19]
Some mammals, like humans or cats, give birth to tiny, helpless infants, barely bale to do more in its first few weeks of life than root around for sustenance from its mothers bodies.
All modern mammals give birth to live young, except the five species of monotremes, which lay eggs. The most species-rich group is the viviparous placental mammals, so named for the temporary organ used by offspring to draw nutrition from the mother during gestation.
Monotremes differ from other mammals because they lay eggs instead of giving birth. There are only five species of monotremes, and they include the platypus and four species of echidnas (spiny ...