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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'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 it? 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

...