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Monotremes (/ ˈmɒnətriːmz /) are mammals of the order monotremata The platypus and four types of echidnas 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 There are only five living species of monotremes Monotremes are typified by structural differences in their brains, jaws, digestive tracts, reproductive tracts, and other body parts, compared to the more.
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 Learn about the amazing monotremes (mammals that lay eggs) that are found only in australia and new guinea. 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
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.
Learn about the surprising mammals that lay eggs and the biological traits that confirm their classification.
With their ancient origins, strange biology, and limited range, platypuses and echidnas are natural marvels. 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. Most mammals give birth to live young These creatures are known as monotremes The unique mammals that lay eggs the mammals that lay eggs are known as monotremes, belonging to the order monotremata
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