What Do You Know About Egg Hatch And Pouched Mammals?


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Shumaela Rana Profile
Shumaela Rana answered
Egg laying mammals lay eggs. Mostly two eggs are laid in a year. Fertilization of eggs is internal and i.e. Inside the body of mother. Eggs are laid in burrows of animals. Young ones are hatched from the eggs. Their egg laying character shows their relationship with reptiles. Examples are Duck bill platypus and spiny ant eater. These mammals have a pouch outside the belly called marsupium, so they are called marsupial mammals. Fertilization of eggs and development of embryo in pouched mammals is internal.    In these mammals, the embryo is at first encapsulated by shell membrane and floats free for several days in the urine fluid. After hatching from the shell membranes, the embryo does not implant or takes root in the uterus and absorbs nutrient secretions from the vascularized yolk sac. The gestation period is brief and marsupials give birth to tiny young that is effectively still an embryo. These young crawl into the marsupium where it gets milk from mother. It lives in marsupium until it can take care of itself. Examples are kangaroo, koala, Tasmanian wolf, and wombat etc. These are found in Australia and Tasmania. Opossum is found in America and it lives on trees.
Patricia Devereux Profile
I assume you mean mammals that lay eggs and those that bear their young in a pouch -- marsupials.Only two mammals actually lay eggs: the duck-billed platypus and the spiny echidna.Platypuses (Ornithorhynchus anatinus) live in freshwater streams in southeastern Australia and in Tasmania. They have a broad, fleshy bill like a duck, dense and waterproof fur, webbed feet, and a broad, flattened tail.

Echidnas (Tachyglossus aculeatus) are nocturnal, hedgehog-like, burrowing animals in Austrailia, Tasmania, and New Guinea. They have spiny backs, toothless mouths, and long, prehensile tongues.Platypuses and echidnas are considered some of the most primitive mammals; as such, they lay leathery eggs, unlike other mammals whose birth sacs (uteruses filled with placenta) have become internal.

Marsupials -- kangaroos, wallabies, wombats, bandicoots, opposums -- are found on many continents. They bear live young, but lack nutritious placenta. So the tiny, nearly fetal babies must crawl up to a pouch on the mother's abdomen to find a nipple. The young continue to stay in the pouch for protection and food for a long time.

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