Traditional Linnaean taxonomy: animals are classified according to what inherent physical traits they share
Phylogenetic nomenclature: animals are classified according to what we can deduce about their ancestry with the help of more recent science like genetics
Diogenetic nomenclature: an individual’s species and even class and genus can be changed by removing or adding a defining feature (i.e. a chicken with feathers removed is no longer a bird, and becomes part of another class, genus and species whose defining characteristics include lack of feathers)
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