In fact, it would seem that such habits are a symptom of homicidal tendencies. See the article Cruelty on the Couch whose introduction reads, When an animal is abused, most people see an act of petty violence. Dr. Stephanie LaFarge sees a warm-up crime -- and an offender who may soon move on to a human victim. Full text is at http://www.nymag.com/page.cfm?page_id=209
Carl
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