Quantcast
Environmental News for a Healthier Planet and Life

‘Absolutely Magical’: Southern California Sees Largest Painted Lady Migration Since 2005

Popular
‘Absolutely Magical’: Southern California Sees Largest Painted Lady Migration Since 2005
Painted Ladies feeding near Thousand Palms, California as part of a massive migration north. David McNew / Getty Images

Southern California is in the midst of a "magical" surprise: unusually large swarms of Painted Lady butterflies filling the skies from San Diego to Pasadena.

"Everyone was posting about the butterflies all over Instagram," a woman told CBS Los Angeles Tuesday. "I saw so many, it was kinda like a swarm of them. It was pretty insane."


The butterflies are passing through as part of their yearly migration from the deserts of Southeast California to the Pacific Northwest, but this year they are doing so in numbers not seen since 2005, when they totaled around one billion.

"When they are scarce nobody notices them," University of California (UC) Davis ecologist Art Shapiro told The Los Angeles Times. "When they are abundant, everyone notices."

For Shapiro, who has been monitoring California's butterflies for almost 50 years, it's a welcome change. He only counted 25,200 Painted Ladies in 2018, down from 315,997 the year before, an alarming trend in a state that is seeing butterfly populations decline across the board.

But this year, that trend has reversed and then some.

"They were flying parallel to me, just bobbing along as I rode past the date palms," The Living Desert Zoo and Gardens Conservation Director James Danoff-Burg told The Los Angeles Times. "It was absolutely magical. I felt like a Disney princess."

The reason for the population's explosion has been California's unusually wet winter.

"The average annual rainfall in the Coachella Valley is 3 inches," Danoff-Burg said. "This year, we had 3½ inches on Valentine's Day alone."

The rain led to a desert wildflower bloom, giving the caterpillars more to eat and a greater chance of surviving. Anza-Borrego Desert State Park, for example, has reported excellent wildflower viewing this year, NBC News reported.

However, the Painted Lady rebound doesn't necessarily mean that other California butterflies will recover.

"They are a boom-bust species," University of Nevada, Reno ecologist Matt Forister told The Los Angeles Times. "In some ways, they are the most successful butterflies on the planet."

California's overall butterfly population reached historic lows in 2018. A monarch butterfly count found numbers of the iconic species were down 85 percent compared to the year before, and Forister said at least 20 other species were declining even faster than the monarch.

Scientists think land use and farming changes that lead to less open space and fewer butterfly-friendly plants, an increased use of pesticides and climate change could all be contributing to a decrease in butterflies.

"There is not one cause for the butterfly decline — that's not how population extinction happens," Forister said. "It's more likely a suite of factors that are pushing on all these species."

Painted Ladies, though, are tough.

"They can pace cars at 25 miles per hour," Shapiro told NBC News.

The butterflies travel north for as long as their fat reserves will take them, then pause to breed. The next generation continues the trip. The butterflies then migrate back south in the winter.

A seagull flies in front of the Rampion offshore wind farm in the United Kingdom. Neil / CC BY 2.0

By Tara Lohan

A key part of the United States' clean energy transition has started to take shape, but you may need to squint to see it. About 2,000 wind turbines could be built far offshore, in federal waters off the Atlantic Coast, in the next 10 years. And more are expected.

Read More Show Less

EcoWatch Daily Newsletter

By Frank La Sorte and Kyle Horton

Millions of birds travel between their breeding and wintering grounds during spring and autumn migration, creating one of the greatest spectacles of the natural world. These journeys often span incredible distances. For example, the Blackpoll warbler, which weighs less than half an ounce, may travel up to 1,500 miles between its nesting grounds in Canada and its wintering grounds in the Caribbean and South America.

Read More Show Less

Trending

Kevin Maillefer / Unsplash

By Lynne Peeples

Editor's note: This story is part of a nine-month investigation of drinking water contamination across the U.S. The series is supported by funding from the Park Foundation and Water Foundation. Read the launch story, "Thirsting for Solutions," here.

In late September 2020, officials in Wrangell, Alaska, warned residents who were elderly, pregnant or had health problems to avoid drinking the city's tap water — unless they could filter it on their own.

Read More Show Less
Eat Just's cell-based chicken nugget is now served at Singapore restaurant 1880. Eat Just, Inc.

At a time of impending global food scarcity, cell-based meats and seafood have been heralded as the future of food.

Read More Show Less
New Zealand sea lions are an endangered species and one of the rarest species of sea lions in the world. Art Wolfe / Photodisc / Getty Images

One city in New Zealand knows what its priorities are.

Dunedin, the second largest city on New Zealand's South Island, has closed a popular road to protect a mother sea lion and her pup, The Guardian reported.

Read More Show Less