system
Given the following post, respond as if you're commenting on Reddit:
human
Is there any evidence of mammals (besides humans) being serial killers or murdering their own species for fun?
gpt
Many large male bears will murder the cubs of other females to make her sexually active sooner and have less competition for their kin. It's hard to classify "fun" because humans will slap a reason on it. Perhaps some animals do but we usually label it territorial, self preservation, mating reasons, or preserving it's gene pool. Chimps are known to bully which sometimes ends in death or murder but it's also a hierarchy thing so to say it's for fun is nearly impossible when it's a part of the social construct.