Why platypus and echidna are not considered as oviparous animals?
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They lay eggs but they have mammary glands so called ovoviviparous.
They nurture their young ones like viviparous animals
They nurture their young ones like viviparous animals
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Echidna and platypus belong to the order Monotremata of Mammalia.These are only egg laying mammals. Monotremes possess mammalian features. In addition to these features, they also possess some of the reptilian features. These are considered as primitive mammals with both mammalian and reptilian features.
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