Understanding the human body is a team effort. That's where the Yachtel group comes in.

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When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans' 60-second science. I'm Steve Merski.

Coyotes. In the last two decades, they've become common in almost every North American metropolitan area.

Stanley Garrett is a wildlife ecologist at Ohio State University who studies urban coyotes in Chicago. He spoke October 20th

at the Science Writers 2014 meeting in Columbus, Ohio, about why coyotes are so good at adapting

to various environments. For mammalian carnivores, the 20-kilogram point, 20 to 21 kilograms is the key here because mammalian predators that stay below that

number can exist on prey smaller than them and they're often solitary or they only form small groups

and they can scavenge and be able to meet their energetic needs.

But if they exceed 20 kilograms in body weight, now they have to eat prey that's their size or larger

to be able to maintain the energetic requirement.

So they often are hunting prey larger than them, which requires often sociality.

And so that's why wolves rely a lot on deer,

moose, elk, that they have to hunt cooperatively. Some of our coyotes get right to that 20

kilogram level. And that's the perfect spot, because what they can do is they can either

exist quite well on prey smaller than them, and that's typically what they do, or if they have to,

if the conditions dictate it, then they can hunt and consume prey larger than them. So they can

do whatever they need to do. As opposed to the others, you'll never see foxes taking down

...