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Old 12-11-2019, 12:37 AM
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Originally Posted by Andy L View Post
... But any taxonomic grouping that includes what people think of as dinosaurs also includes all birds, including dinosaurs....
Nitpick: That's true if by "taxonomic grouping" you mean "monophyletic taxonomic grouping," but in fact paraphyletic groupings are in widespread use.

If only monophyletic groupings are allowed, then insects are crustaceans, butterflies are moths, snakes are lizards, ants are wasps, whales are even-toed ungulates, trees are algae, humans are fish, all mammals are sponges, and ... all living creatures are bacteria!