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

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yachtold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtol, visit yawcult.co.

J-P. That's Y-A-K-U-L-T dot-C-O-J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans 60 Second Science.

I'm Jason Goldman.

We literally get down on our hands and knees and start slowly sifting through the leaf litter,

looking for bits of hair or a little chunk of bone.

Tom Gable is tracking a predator.

In fact, he's tracking a whole pack of them. Oh, it's very much like a crime scene investigation.

Since 2015, the University of Minnesota conservation biologist

has used GPS collars to track 30 wolves inside Voyager's

National Park. Those collars led Gable and his team to kill sites, and there, amid the

leaf litter were bloodied bits of fur and bone, clues about how wolves alter the ecosystems

they live and hunt and kill in.

The long-term study is, in a way, a quest to broaden a science story that goes back 25 years.

For wildlife ecologists, the story of the reintroduction of wolves to the greater Yellowstone ecosystem

on January 12, 1995, has become canonical. The story goes

something like this. As the elk grew to fear the wolves, they changed where and how they foraged.

That gave willows, cottonwoods, and aspens a better chance to grow near streams. It also meant

more riverside berries for foraging grizzly

...