In reply to owena:
> can animals be evil, or is it a human quality to be able to do something harmful to another creature for its own gratification rather than necessity?
You appear to use 'necessity' from an anthropogenic angle. Consider this piece by Stephen Gould and decide if it was 'necessary' for evolution to take this turn:
"The ichneumon, like most wasps, generally live freely as adults but pass their larva life as parasites feeding on the bodies of other animals, almost invariably members of their own phylum, the Arthropoda. The most common victims are caterpillars (butterfly and moth larvae), but some ichneumons prefer aphids and other attack spiders. Most host are parasitized as larvae, but some adults are attacked, and many tiny ichneumons inject their brood directly into the eggs of their host.
The free-flying females locate an appropriate host and then convert it into a food factory for their own young. Parasitologists speak of ectoparasitism when the uninvited guest lives on the surface of its host, and endoparasitism when the parasite dwells within. Among endoparasitic ichneumons, adult females pierce the host with their ovipositor and deposit eggs within. (The ovipositor, a thin tube extending backward from the wasp’s rear end, may be many times as long as the body itself.) Usually, the host is not otherwise inconvenienced for the moment, at least until the eggs hatch and the ichneumon larvae begin their grim work of interior excavation.
Among ectoparasites, however, many females lay their eggs directly upon the host’s body. Since an active host would easily dislodge the egg, the ichneumon mother often simultaneously injects a toxin that paralyzes the caterpillar or other victim. The paralyzes may be permanent, and the caterpillar lies, alive but immobile, with the agent of its future destruction secure on its belly. The egg hatches, the helpless caterpillar twitches, the wasp larvae pierces and begins its grisly feast.
Since a dead and decaying caterpillar will do the wasp larvae no good, it eats in a pattern that cannot help but recall, in our inappropriate anthropocentric interpretation, the ancient English penalty for treason — drawing and quartering, with its explicit object of extracting as much torment as possible by keeping the victim alive and sentient. As the king’s executioner drew out and burned his client’s entrails, so does the ichneumon larvae eat fat bodies and digestive organs first, keeping the caterpillar alive by preserving intact the essential heart and central nervous system. Finally, the larvae completes its work and kills its victim, leaving behind the caterpillar’s empty shell."
I don't think we have free will as such. Personally I think we are the product of our biology - evolutionary compromise and hormonal drive.