My son found this banger that we took home from the library last week. It's full of insect fights like a mantis vs a cockroach, wasp vs spider and a tiger leach vs a velvet worm. At the end it shows who won. Looks like they were all battles till death.

When I was in high school we used to make up battles and ask each other who would win like a pitbull vs a wolf or 10 geese vs a goat. Maybe this is something young boys are into and sports like MMA exploited this drive to some degree.