How is it that Dalmatians and Chihuahuas are so different but are members of the same species, yet two sparrows that look nearly identical are different species?
In: Biology
We have decided that the definition of species includes those two dogs, but not those two birds. That’s pretty much it. There are many definitions of species, but what they all have in common is how *useful* they are. No serious definition of species will define a chihuahua and a fir tree to be the same species for a variety of differences. Those differences are the same ones used to determine a chihuahua and a dalmatian to be the same species, but two different sparrows as different ones.
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