Article: Savage siblings.(sibling behavior in animals)(includes related information on helpful behavior in animal siblings)

If you trade insults with your brother or sister every waking moment, you might think you have the worst sibling relationship on Earth. Think again! Some members of the animal kingdom take sibling rivalry to the max. They kill their brothers and sisters to survive!

Murdering a sibling, or siblicide, may seem cruel. Fortunately it's not the most common behavior in the animal kingdom. In fact, many animals have amicable sibling relationships (see "Family Bonds," p. 10). But when there's a short supply of food, some birds, insects, fish, and mammals snare their share by killing their closest competitors -- their sibling

Scientists have known for years, ...

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