A large group of vertebrate animals that develop inside a protective membrane called the amnion, including reptiles, birds, and mammals.
From the Greek root 'amnos' (lamb) plus the suffix '-ota' (plural), referring to animals with an amnion. This taxonomic term was created in the late 19th century to classify vertebrates based on this shared evolutionary feature.
Amniotes represent a major evolutionary leap—the amnion was like nature's invention of the 'portable womb,' allowing vertebrates to reproduce on land instead of in water, which opened up the entire terrestrial world to colonization!
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