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This is Scientific American 60-second science. I'm Christopher Ndalata. Got a minute?

Biologists used to think turtles belong to the silent majority of reptiles, meaning if turtles made

sounds, no one was listening. One reptile guide from the 1950s went so far as to call them,

quote, deaf as a post. But it turns out scientists just weren't listening hard enough,

because in recent years, biologists have identified at least 11 different sounds in the turtle repertoire.

Recorded both in and out of the water.

But what do they mean?

In the latest attempt to decode turtle talk, researchers tailed giant South American river

turtles, Podok Nemus Expansa, in Brazil, over a two-year span. They recorded 220 hours of audio,

capturing six of those 11 sounds. Two of the calls were extremely common, occurring during

just about every turtle activity. Other calls the turtles made only during

migration, or while nesting at night. The findings appear in the journal Herpetologica. The researchers

still aren't sure what any of these sounds actually mean, or whether turtles can recognize each other

by voice alone. All the more reason, they say, to use these sounds in playback experiments,

which might get these talking turtles out of their shells.

Thanks for the minute. For Scientific American's 60 Second Science, I'm Christopher Entagiot.