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You're listening to a way with words to show about language and how we use it.

I'm Grant Barrett.

And I'm Martha Barnett. As you know, I do a lot of hiking in the mountains around San Diego County.

And I find that often when I get up to around 4,000, 5,000 feet, I'll suddenly see butterflies.

And they're usually these beautiful black and yellow swallowtails.

They're kind of big, and they're right up there on

the mountain peaks and the first time I went up there and saw them I thought well

cool you know we're all celebrating I got up here the second time I thought well that's

weird it happened again and the third time I

thought what is going on here every time I go to a mountaintop there are butterflies and

sure enough I learned last week on a hike with some guides from the San Diego Natural History Museum that indeed there's a word for this.

It is a thing.

What is the hill topping?

Hill topping is what the butterflies are doing?

Yeah, yeah, it's called hill topping and it turns out that male butterflies of many species

they'll go and hang out on top of mountain tops waiting for the ladies and the ones that go to the highest point clearly have the best genes and it's sort of like

...