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This is Scientific Americans' 60-second science.

I'm Jason Goldman.

As animals grow, the sounds they make change.

But some sounds continue to change even after an animal matures.

That's true for humans, and now it turns out to be true for North Atlantic right whales, too.

A member of the Baleen family of whales, the endangered North Atlantic right whales, spend

most of their time along the eastern coast of North America, from Canada's Bay of Fundy, south

of Florida. Syracuse University biologist Holly Root-Gutridge analyzed recordings of whale calls

to see if researchers could use those sounds to identify individual whales. In an audio program

on a computer screen, a call has a particular shape. Staring at these calls all day, I started to notice

they were changing, and then we looked a little bit harder at the data and realized that they weren't just changing

from being a little tiny baby to being and fair-sized adult, but that they kept changing

over time.

Root Gut Regener colleagues rounded up 17 years' worth of whale recordings.

In all, they gathered nearly a thousand calls from 49 individual whales between

the ages of one month and 37 years. Like many other animals, the calls of the infants were

...