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.

Yacold 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 Yachtolt, visit yawcult.co.

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

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

30 million white-tailed deer now live in North America.

That's a lot of deer.

Megan Gall, a sensory ecologist at Vassar College in Poughkeepsie, New York.

In her Hudson Valley locale...

There is a recent estimate here that you could have somewhere between 20 and 40 deer per square mile.

These prolific grazers have been blamed for many things, munching on baby trees.

And that's a big problem because they are going to prevent forest regeneration.

They also change the structure of the forest understory.

Which is no good for birds that live there, for small rodents that live there.

And they contribute to the Lyme disease problem as tick hosts. To all that, we can now add a new

accusation that deer are altering the very acoustics of the forest by pruning trees and changing

the way sounds, like bird calls, travel through the trees.

Gaw and her team investigated plots of forest where a deer graze and others where they were excluded.

In each 30 by 30-foot plot, they placed a speaker at one end, playing white noise,

tones, or trills, and recorded it all with a microphone in the opposite corner. Then they used software to analyze the recorded sounds. They found that while there was no difference in the loudness

of the captured sounds among the plots, the recordings captured and the grazed upon plots

...