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Monotremes (/ ˈmɒnətriːmz /) are mammals of the order monotremata They lay eggs, have a cloaca (a single body opening), and lack nipples, instead secreting milk through skin. 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 Monotremes possess a combination of reptilian and mammalian features 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. Only five species of mammals actually lay eggs, and they're called monotremes These incredible creatures represent some of the most primitive mammals on earth, having evolved separately from other mammals over 200 million years ago. 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
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