Birds are reptiles?
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Are birds reptiles? The answer depends on what taxonomy system you’re using. Taxonomy is how scientists classify and organize living things. In older systems, reptiles were grouped by physical traits: cold-blooded, scaly, egg-laying animals. Birds didn’t fit, so they were placed in their own category. But today, most biologists use a system based on clades—groups that include an ancestor and all its descendants. In this system, birds evolved from within the reptile group, specifically from theropod dinosaurs. That makes them part of the reptile clade, whether they lay eggs or fly or have feathers. So yes, by modern evolutionary taxonomy, birds are reptiles—just highly specialized ones. For details see the 2004 paper: "The Phylogenetic Definition of Reptilia"
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