Aren't all animals in the process of evolving? Shouldn't each animal be its own species? The notion of species, nature or essence seems very (gasp) medieval to me...
> Aren't all animals in the process of evolving?
Nope. All *species* are. *You* will never evolve. Your offspring will. Maybe.
> Shouldn't each animal be its own species?
Give it a shot. Next time you nail your missus, turn yourself over to the authorities for an immediate stoning.