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Monotremes (/ ˈmɒnətriːmz /) are mammals of the order monotremata These odd monotremes once dominated australia, until their. They are the only group of living mammals that lay eggs, rather than bearing live young
The extant monotreme species are the platypus and the four species of echidnas The monotremes are a group that. Monotremes are typified by structural differences in their brains, jaws, digestive tracts, reproductive tracts, and other body parts, compared to the more.
After fertilization, eggs develop within the reproductive tract before being laid
Monotreme eggs are small (about 1.5 cm in diameter), leathery, and contain yolk for nourishment Learn about the amazing monotremes (mammals that lay eggs) that are found only in australia and new guinea. We learn early on in school that what one of the distinguishing characteristics of mammals is that unlike birds, reptiles, and fish they bear live young There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs
Why do some mammals lay eggs instead of giving birth Some mammals, like monotremes, reproduce by laying eggs instead of giving birth because they represent an ancient evolutionary stage between reptiles and modern mammals Millions of years ago, the ancestors of all mammals likely laid eggs, just like reptiles and birds do today While most mammals eventually adapted to give birth to live.
With their ancient origins, strange biology, and limited range, platypuses and echidnas are natural marvels.
We know that birds and fish lay eggs While most give birth to live young, there are some mammals that lay eggs They are known as monotremes. While most mammals give birth to live young, monotremes—such as the platypus and echidnas—are exceptions that lay eggs
Platypus and echidnas' evolutionary traits Monotremes possess a combination of reptilian and mammalian features They lay eggs, have a cloaca (a single body opening), and lack nipples, instead secreting milk through skin. Animals that lay eggs, or produce milk without nipples, or possess venomous spurs, typically belong to groups like the amphibians or the sauropsids (aka reptiles)
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