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Science Quickly

Mucus Lets Dolphins Emit Their Clicks

Science Quickly

Scientific American

Science

4.2639 Ratings

🗓️ 14 July 2016

⏱️ 4 minutes

🧾️ Download transcript

Summary

A model of the dolphin vocal apparatus shows that they need a coating of mucus to produce their distinctive sounds.   Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0

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

0:05.8

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

0:11.0

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

0:19.6

To learn more about Yachtolt, visit yawcult.co.

0:22.7

.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.

0:33.6

This is Scientific Americans' 60-second science.'m Karen Hopkin. Got a minute?

0:39.9

Sometimes a snoutful of snot can be just what the doctor ordered, at least if you're a dolphin,

0:45.3

because a new study shows that a little bit of mucus helps these marine mammals generate the rapid fire stream of clicks they emit and use for echo location.

0:56.7

First off, let's just get this out of the way. Dolphins do not actually sound like this. That's a made-for-TV

1:03.2

giggle that some say is actually the doctored call of a bird, the Australian cuckabura. Real dolphins,

1:09.3

like these bottle noses, sound more like this.

1:16.9

They use their clicks, chirps, and whistles to navigate, communicate, and to catch their

1:22.0

next meal. The high-frequency clicks, in particular, help Flipper and his kind locate and

1:27.2

track fish dinners.

1:29.0

Dolphins make these sounds by forcing air through a nasal passage just beneath the blowhole.

1:34.3

In this nasal region, our lip-like flaps of tissue called dorsal bursay that vibrate and collide

1:40.3

to produce dolphin talk. Now, a team of researchers has created a simplified model that can reproduce this characteristic dolphin chatter,

1:48.0

and they found that the secret ingredient is snot.

1:52.0

While looking through the literature,

1:54.0

oceanographer Aaron Thode stumbled across a model that represented vocal cords as masses connected by springs, which store and release energy,

2:02.6

and dampers which dissipate that energy.

2:05.6

This model successfully replicated the essential characteristics of the system,

...

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