How are chihuahuas and St. Bernards the same species?
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The technical scientific definition of species is pretty different from how it is used colloquially. Technically any two animals that are genetically similar enough to theoretically breed and produce viable children are the same species. So for examle, llamas and alpacas are technically the same species since they can crossbreed, while humans and chimpanzees are different species as they cannot.
This doesn’t mean members of the same species can breed reliably or without complications, it just means it’s genetically possible.
So, because of this, basically all dogs are the same species, including chihuahuas and St Bernards.
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