When male lions take over a new territory, they almost always kill the prides' cubs, since they are not biologically related and do not want to spend energy ensuring that other lions' genes will be passed on.
Nope... the real reason has been discovered by Ethologists and is shown in the attachment above.
Many long years ago, when I tended to frequently imbibe, I received a Birthday card from former girlfriend. Inside, it said BEER IS FOOD!She was useless in the sack, but she did understand me.