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Photos: Swarm of painted lady butterflies fill the sky in California during migration

By Chaffin Mitchell, AccuWeather staff writer

Published Mar 19, 2019 3:00 PM EDT | Updated Jul 1, 2019 4:59 PM EDT

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Painted lady butterflies travel for migration
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Some would be terrified of a swarm of millions of insects, except this one happens to be beautiful butterflies called painted ladies.

They are taking over the skies in Southern California as they make their way north for migration.

The butterflies reside in warmer areas but migrate in spring and sometimes again in autumn.

"The painted lady migration is not rare but rather has been taking place for centuries. In some years, the numbers aren’t as pronounced as they are this year," President of Butterfly Rescue International, Lepidopterist Rick Mikula said.

Imagine this happening outside of your windows for hours at a time. Video on March 18 shows migrating painted lady butterflies taken just outside of Carlsbad, California.

These painted ladies are known to travel annually from the deserts of Southern California to the Pacific Northwest.

In California, they are usually seen flying from north to northwest.

"This year’s huge increase can be attributed to the California rains which help to increase the plant life in an otherwise sparse overwintering environment," Mikula said.

Rainfall in the deserts, where the North American painted ladies lay their eggs, is the reason for the large amount this year.

The substantial rain caused plants to thrive, giving the painted lady caterpillars plenty of food.

"More host plants means more caterpillars that will eventually become more butterflies. I have been fortunate to witness such massive migrations firsthand over the past few decades," Mikula said.

Painted lady butterflies are found on every continent except Antarctica and South America.

"I have also experienced massive migrations of snout butterflies in Texas where it was impossible to drive on the highways without using your windshield wipers," Mikula said.

Unlike some other butterflies, painted lady butterflies lack red receptors, which means that they are likely red-green color-blind.

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"The painted is also well renowned for its annual migration from the U.K. to Africa where tens of millions of individuals are actually tracked by radar. On the reverse route they have been shown to fly from Africa as far north as the Arctic Circle," Mikula said.

To help butterflies, such as Monarchs, whose population has been dropping, experts suggest planting milkweed.

<blockquote class="instagram-media" data-instgrm-permalink="https://www.instagram.com/p/Bu7sjGihv_s/?utm_source=ig_embed&amp;utm_medium=loading" data-instgrm-version="12" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:540px; min-width:326px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);">
View this post on Instagram
</a><p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;"><a href="https://www.instagram.com/p/Bu7sjGihv_s/?utm_source=ig_embed&amp;utm_medium=loading" style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none;" target="_blank">A post shared by ALT 98.7 (@alt987fm)</a> on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="2019-03-13T03:11:33+00:00">Mar 12, 2019 at 8:11pm PDT</time></p></div></blockquote>
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Butterfly in the skkkyyy... #paintedladies @WindwardSchool pic.twitter.com/4YYV107br0

— Melanie Arias, Ph.D. (@20thC_Melanie) March 12, 2019

Check out all the painted lady butterflies on the 101 in Encino. Perhaps this is why traffic is moving so slowly. pic.twitter.com/LBVsKa0Cdx

— Jeff Nguyen (@jeffnguyen) March 16, 2019
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AccuWeather Weather News Photos: Swarm of painted lady butterflies fill the sky in California during migration
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