Recent Examples of monotreme from the Web
The platypus is part of a small group of animals called monotremes, which lay eggs and produce milk to feed their young.
Around 80 million years later, the monotremes—or egg-laying mammals—split off from the mammalian lineage, says Rebecca Young, a biologist at the University of Texas at Austin.
There are three kinds of mammals: egg-laying monotremes such as the platypus, marsupials like kangaroos and opossums, and the majority—placental, or eutherian, mammals—including humans and about 4400 other mammal species.
Though monotremes' fossil record is limited, some skulls have been found, such as the extinct Obdurodon dicksoni.
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