Did You Know? Taiwan Was the World’s Butterfly Kingdom — Now It Closes Highways for Them

Taiwan is roughly the size of the Netherlands. It also has more than 400 recorded butterfly species, dozens of which live nowhere else on Earth. For about three decades, that abundance made the island the center of a global industry — and then it made it the center of one of the strangest conservation stories in Asia.

The butterfly factory years

From the 1950s through the 1970s, Taiwan was known internationally as the Kingdom of Butterflies, and that nickname was a trade description as much as a compliment. The mountain town of Puli in Nantou was the industry’s beating heart: collectors brought in wild-caught butterflies from valleys all over the island, and workshops turned them into framed specimens, keychains, greeting cards, and elaborate collages made entirely from cut wings.

The scale is genuinely hard to picture. Estimates of the annual catch at the peak run into the tens of millions of butterflies a year, with the highest figures reaching far higher than that. Taiwanese butterfly art shipped to Japan, the United States, and Europe, and for thousands of rural families it was a real living.

Then the valleys emptied — and came back

By the 1980s the combination of relentless collecting and habitat loss had thinned the swarms badly enough that the trade collapsed under its own weight. What followed is the part worth knowing: Taiwan didn’t just stop, it flipped the whole thing around. The specimen workshops gave way to protected habitat, butterfly-watching guides, and a festival calendar — the same valleys, monetized by keeping the butterflies alive instead of pinning them.

The centerpiece is Maolin Valley in the mountains of Kaohsiung, better known as Purple Butterfly Valley. Every winter, hundreds of thousands of purple crow butterflies (紫斑蝶) funnel south into its sheltered gorges to overwinter, clustering so densely on the branches that the leaves look like they’ve been dipped in oil-slick violet. It is one of only two mass butterfly overwintering migrations known anywhere in the world — the other is the monarch’s famous wintering grounds in Mexico.

The highway that closes for insects

Here’s the detail that still makes people do a double take. When the purple crows fly back north in spring, their route crosses National Freeway 3 near Linnei in Yunlin. So Taiwan’s highway authority closes the outer lane, puts up netting to lift the swarm above traffic height, and posts warning signs — for butterflies. It’s one of the very few road closures on the planet ordered on behalf of an insect, and it happens every year without much fuss, because by now it’s simply what you do.

When to see it

Maolin’s butterfly season runs roughly from November through March, peaking in the coldest months, with the northward migration starting in early spring. If you’re already looking at a winter trip, this pairs neatly with the rest of the island’s December weather — the south stays mild while the north goes grey and damp. And if you like this corner of Taiwan’s wildlife, the Formosan black bear has an equally good story.

The takeaway: Taiwan once exported its butterflies by the million. Now it stops traffic for them. That shift — from catching a thing to protecting it — is one of the most quietly Taiwanese stories on the island.

Speaking of wings: butterfly and Formosan wildlife motifs run through a lot of our designs, and they’re some of our favorite things to put on a tee. Shop Taiwan Merch.