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This is Scientific Americans' 60-second science. I'm Karen Hopkin.

Elephants don't diet, as far as we know, but their weight does fluctuate, at least for the ones who live in a zoo.

Now, researchers have found that this gain and loss in an elephant's mass appears to hinge on their jaws.

More specifically, the unusual way these

animals replace their teeth. The results appear in the journal Mammalian Biology. Researchers at the

University of Zurich's Clinic for Zoo Animals, Exotic Pets, and Wildlife were exploring how an elephant's

mass tracks with its overall physique, whether the animal is jumbo-sized

or spelt, for an elephant. So they gather data on the entire population of captive elephants

throughout Europe. The clinic's Marcus Klaus is a professor of comparative digestive physiology.

This was due to the commitment of a student I had at the time,

who's called Christian Schiffman, who is the driving force behind all this, because Christian

visited basically every European zoo that keeps elephants. He returned with records,

revealing the relative heft of the resident

pachyderms. At first glance, his observations were not so surprising. As in Western societies,

also in the zoo, a lot of beings tend to be less in an ideal potty condition and a little bit more

on the obese side. And elephants are just the same in that respect.

But a deeper dive into the data turned up something curious.

...