The horror...the (fluffy) horror

Have I mentioned hamsters' unsavoury habits here before?  I certainly have read about them being amongst the worst rodents for maternal cannibalism, but this hamster-ghoulish article at Slate makes the case that these cute as a button rodents are actually the Hannibal Lecters of the rodent world:

It’s also strange that Syrian hamsters should be popular, considering they’re ferociously territorial. If you’re going to keep two or more adults in the same tank, they require lots of personal space. The animals have scent glands on their flanks, which they use to mark territory, so it’s also recommended that you provide separate food, water, and bedding sources. Fail to give them enough space or resources, and they’ll eat each other for fun.

I’ve seen it.

I thought I’d provided Frank and Shirley with a hamster Taj Mahal. They had tubes leading to running wheels and skylights and loop-de-loops. Fresh water and all the seeds they could eat. All the same, one day I came home from elementary school to find Shirley huddled up in a corner. What was left of Frank—a wad of wet fur, a few toothpick-like bones—lay among the wood chips.

And we get a fair bit of detail about how extremely common it is for hamster mother's to snack immediately on a couple of offspring:

For those in the hamster biz, it’s accepted that more than 75 percent of Syrian hamster dams (mommies) will cannibalize part of their litter within the first day of birth. Beery’s own research suggests this estimate is probably on the low side.

In fact, in an experiment that had her up at all hours of the night checking for births, Beery found that 100 percent of her dams ate between 2 and 11 pups. (A second experiment showed a cannibalization rate of 74 percent, though Beery says they only checked the litters in the morning, which means they likely missed middle-of-the-night cannibalization in the other 26 percent.)

The reasons why they do this are not at all clear, as you can read in the article.   And even in the wild, adult hamster life is a constant danger, at least for the males (even though, oddly, it seems the Mums prefer to eat their female babies):

Unfortunately for the hamsters, the carnage extends beyond birth. Syrian hamsters are solitary in the wild. When they’re not in heat, females are extremely aggressive. And because estrous occurs about one out of every four days, that means enterprising males run the risk of disembowelment about 25 percent of the time. (Remember those scent glands? A male hamster’s ability to detect estrous may save his life.)

I'm not sure that there is any popular pet with quite the same disturbing habits.

Pet rats, incidentally, have a much nicer reputation re cannibalism.