[From a paper by one of my students:] According to DarwinÃ¢â‚¬â„¢s theory, humans are separated from the animals only by a matter of degrees, not by categories. This is the working presupposition behind the evolutionary ethics of James Rachels. Thus, there can be no fundamental difference between Ã¢â‚¬Å“evilÃ¢â‚¬Â committed by rhesus monkeys and that committed by the Great Apes Ã¢â‚¬â€œ- Homo sapiens. This is where the reductio meets the ad absurdum. To argue that crimes committed by animals and those committed by humans are equivalent does not comport with reality and it does not jive with our experience. While we do have pet cemeteries, we do not have pet penitentiaries. No one incarcerates a Mantis religiosa for the copulatory consumption of her mateÃ¢â‚¬â„¢s head, but Scott Peterson is justly sentenced for murdering his pregnant wife.