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Hey, welcome to Stuff to Blow Your Mind.

This is Robert Lamb.

If you've been listening this week, you know the deal.

We're on vacation.

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This is going to be part two of three, and it originally published 520, 2025.

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Welcome to Stuff to Blow Your Mind, a production of IHeart Radio.

Hey, welcome to Stuff to blow your mind.

My name is Robert Lamb.

And I'm Joe McCormick, and we're back with part two in our series on urine-based communication in animals.

In part one, we introduced the idea that while humans have an almost infinitely expanding arsenal of tools and skills and tricks for sharing information with one another, one medium that we don't use,

or at least don't use very much, but which is used throughout the animal kingdom is urine.

So in part one, we also talked about a story that, uh, the story that initially

got me interested in covering this on the show, which was a recent paper documenting a

behavior in Amazon River dolphins called aerial urination, uh, which goes like this. One male

dolphin floats upside down and urinates in a stream up in the air over the water,

and then usually another male dolphin, seeks out the stream, swims over, and puts its face right into the pea fountain.

It's not yet known why the dolphins do this, but the researchers who wrote the paper proposed that it is a form of communication.

It's information sharing between male dolphins to sort of give a fact sheet about the originator of the urine stream.

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