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They carry their offspring for almost two years before giving birth. The huge animals have the longest pregnancies of all mammals. But the 22 month gestation period is not just because of their size.
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 ...
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]
English: Cow giving birth to a calf, in a garden in Laos. Step by step, montage in 9 pictures. 1. Kneeling cow. At the beginning, the amniotic sac comes out of the vulva under the raised tail. 2. The head of the calf appears out of the vulva after the two first legs in front. 3. View from behind.
A cow giving birth. Birthing in cattle is typical of a larger mammal. A cow goes through three stages of labor during normal delivery of a calf. During stage one, the animal seeks a quiet place away from the rest of the herd. Hormone changes cause soft tissues of the birth canal to relax as the mother's body prepares for birth.
The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians. See List of monotremes and marsupials, and for the clades and families, see Mammal classification ...
Here are 10 animal mothers that die after giving birth. For some species bringing new life into the world also serves as a final act. Here are 10 animal mothers that die after giving birth.
Marsupials give birth to a live but relatively undeveloped foetus called a joey. When the joey is born it crawls from inside the mother to the pouch. The pouch is a fold of skin with a single opening that covers the teats. Inside the pouch, the blind offspring attaches itself to one of the mother's teats and remains attached for as long as it ...