Are birds technically dinosaurs?

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If all life perishes, there would be nothing on the planet. In the case of the dinosaurs, it is likely that a few very lucky dinos survived the meteorite, and over time evolved into birds. The meteorite did not kill all living beings, otherwise the earth would most likely be a barren wasteland. Therefore, the birds of today all trace lineage to those very lucky dinos millions of years ago, making them an extension of the dinosaur family tree.
Birds lived alongside Cretaceous dinosaurs. Birds as a seprate group diverged in the very late Jurrassic. The way evolutionary descent works means that we are Reptiliomorpha, because our ancestors decended from permian therapsids like the ugly Gorgonapsid. So yes, they are an extension of the dinosaurs.
 
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If dinosaurs were annilated, then birds ARE a separate species. Dino s are not relatives. That is absurd.
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Small, feathered therapods eventually diverged into birds and the groups we think of when we think 'velociraptor'. Are your grandparents still your ancestors even if they and your Aunt are dead?
 
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Birds are descended from dinosaurs, but it depends on whether you think that they have evolved away from dinosaurs enough to consider them different or not. Some taxonomists, called cladists, group animals by whether they all come from one common ancestor. Therefore,they would make reptiles and birds into one group.
Not all reptiles came from dinosaurs, but all birds came from dinosaurs. If you are wondering why modern lizards do not have the same stature dinosaurs do, is because the Crocodylomorpha surrvived the extinction. But you are right that modern taxonomy is not as based on physical characteristics as it is on the phylogeny. The previous groupings are now obsolete and kept around at certain levels hust because we want to.
 

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