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The name is something of a misnomer, considering that marsupials also nourish their fetuses via a placenta, [3] though for a relatively briefer period, giving birth to less-developed young, which are then nurtured for a period inside the mother's pouch.
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 ...
A litter is the live birth of multiple offspring at one time in animals from the same mother and usually from one set of parents, particularly from three to eight offspring. The word is most often used for the offspring of mammals , but can be used for any animal that gives birth to multiple young.
Studies have indicated that fetuses react to and recognize differences between sounds. [22] Such ideas are further reinforced by the fact that newborns present a preference for their mother's voice, [ 23 ] present behavioral recognition of stories only heard during gestation, [ 24 ] and (in monolingual mothers) present preference for their ...
Altricial young (marsupials, rodents) are completely helpless and dependent on their mothers, precocial young (elephants, cattle) have highly developed sensory and motor functions at birth, and primates who are semi-helpless young, have an intermediate level of maturation. This variation in maturation at birth requires different maternal care ...
Fishes that give birth to live young can be ovoviviparous, where the eggs are fertilized within the female and the eggs simply hatch within the female body, or in seahorses, the male carries the developing young within a pouch, and gives birth to live young. [43]
When Shari, a mom of two from Missouri and owner of Stitched_By_Shari, received a request for a crocheted a doll that mimics giving birth, she thought the request was a little odd.
Vivipary is rare in snakes, but boas and vipers are viviparous, giving birth to live young. [29] Female aphid giving birth. The majority of insects lay eggs but a very few give birth to offspring that are miniature versions of the adult. [18] The aphid has a complex life cycle and during the summer months is able to multiply with great rapidity.