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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

High cholesterol affects one-third of American adults, but it's not just us.

Studies have indicated that cholesterol is also on the rise in other animals.

And in all of these studies, the idea was, well, they hypothesized that it was probably due to interactions with people

in eating our food, but they didn't actually show that. Andrea Townsend is an avian ecologist

at Hamilton College in upstate New York, and she found that urban crows did have higher cholesterol

than rural crows. But then she took the next logical step in her research, she went to McDonald's.

We'd pick up 125 burgers at a time. Once, one of them wanted to know what we needed all these

burgers for, and then I started to explain, but they just kind of waved me away halfway through.

Of course, she needed all those cheeseburgers to feed the crows and to monitor their diet

to determine if eating our fast

food really does raise the bird's cholesterol. So the way you supplement your nestling is we'd go

to their nest trees and we'd toss the cheeseburgers three a day, three to five a day, under their

nest trees and then the parents immediately swoop down, pick up the burgers, and bring them to the nestlings.

And as you might expect, crows that dined on cheeseburgers did indeed have higher cholesterol than

crows who did without. But here's the surprising thing. Higher cholesterol didn't actually

affect crows' chances of survival over a three-year period. And in one population, birds with higher cholesterol

...