I fucking hate hamsters. If you thought humans had a monopoly on doing unspeakably nasty things to their own species, you have clearly never kept multiple hamsters.
Not only do the hamsters randomly beat eachother up, not only do the females attempt to castrate the males with their teeth on occasion, but they're all infanticidal cannibals - more so than any other species of animal. The worst part, though, is when they eat part of one of their offspring without managing to kill it.
A couple days ago, I had to deal with a pinkie the adults had eaten the face off of (right below the eyes - hamsters are such a joy). I think this marks the first instance where I have actually uttered the phrase "God have mercy." None of the snakes would touch it - I think they were afraid of it - so I ended up having to drown it.
Working at a pet store is such a joy.