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by elventails
on 20/12/09
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A few reasons why animals kill "their" young:

-lineage: males taking over leadership of a group. Killing existing young ones, promotes their own offspring.
-dominance: enforce dominance over submission group members
-hunger
-psychological stress (yeah, kids can be annoying)
-strategy: gain access to physical resources like food, nesting sites or space; to avoid caring for unrelated offspring; to bias the sex ratio of the litter

The above are quick notes based off of "http://en.allexperts.com/q/Wild-Animals-705/Animals-kill-young.htm"