Let's hear it for evolution!
My junior cat, Adelaide, loves to be outdoors. I have to restrict her explorations to those times when my next door neighbor is not at home - for I have observed this neighbor being quite, let’s say “unkind”, to Adelaide. Said neighbor went out a wee while ago. So I allowed Adelaide to go outside. In truth Adelaide made the decision. She kept coming up to me, mewing, and then leading me to the back door. I am easily persuadable when the coast is clear. Adelaide bounded out. I watched her as she raced around, leaped up a tree, leaped back down, and raced some more. “Sheer joy?” Maybe. More importantly Adelaide was fulfilling her evolutionary destiny. That destiny is to be a hunter. My dear cat was chasing, catching, and sometimes killing some of the many little lizards which abound here. I wept not for the lizards. Evolution is morally neutral. And without the feline Adelaides of this world we could be overwhelmed with lizards!