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Cake day: June 6th, 2025

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  • Getting a little outside my area of knowledge at this point, but my understanding is the main reason is that clades allow for much more granularity than the Linnean taxonomic system. Linnean classification gives a maximum of 7 ways of classifying a species, while clades are only limited by the number of scientifically sound distinctions you can make between groups of species and their ancestors/descendants.

    Example: check out the wikispecies entry for mallards, which are part of 40+ clades (hit the expand link under the Taxonavigation heading)




  • Clades are used for classifying birds and everything else, it’s just a little messier than the neat Kingdom/Phylum/Order/etc way of laying out evolutionary history. If you think of a species as being a specific pinpoint on the tree of life, clades are more like drawing a circle around a lot of pinpoints and branches.

    But yeah, biology is nothing but ‘the last thing we taught you was an oversimplification!’ all the way down.


  • What am I missing here?

    That untangling evolutionary history is really messy :D It’s not part of Kingdom/Phylum/Class/etc classification, but biologists also use clades to understand evolutionary history. Birds and theropod dinosaurs belong to the clade Theropoda, and to the clade Saurischia which includes some more dinosaurs, and they all belong to the Dinosauria clade which includes all dinosaurs.

    The division (as interpreted by evolutionary biologists) between birds and the rest of Saurischia is smaller than the division between Saurischia and the rest of Dinosauria. So, if everything in Dinosauria is a dinosaur, so are birds.