On any given day at the National Butterfly Center in Mission, Texas, visitors can expect to see more than 60 varieties of butterflies. In the spring and fall, monarchs and other species can blanket the center’s 100 acres of subtropical bushlands that extend from the visitor center to the banks of the Rio Grande River, where its property, and U.S. sovereignty, ends.

“It’s like something from ‘Fantasia,’” said the center’s director, Marianna Wright. “When you walk, you have to cover your mouth so you don’t suck in a butterfly.”

Today the most diverse butterfly sanctuary in the country and other protected areas in the lower Rio Grande Valley along the U.S.-Mexico border are under threat. The U.S. Supreme Court recently issued a ruling allowing the Trump administration to waive 28 federal laws, including the Endangered Species and Clean Air acts, and begin construction on 33 new miles of border wall in the heart of the valley — and right through the butterfly center.

(Delcia Lopez | For the Guardian) Butterflies are seen at at National Butterfly Park on Tuesday Dec. 11, 2018, in Mission, Texas.

“Environmental tourism contributes more than $450 million to Hidalgo and Starr counties,” said Wright, referring to the adjacent counties in the valley. “Many of the properties people choose to visit to see birds, butterflies and threatened and endangered species are all going to be behind the border wall. For us, the economic impact is potentially catastrophic.”

“Walls have fragmented our habitat,” said Scott Nicol, co-chairman of the Sierra Club Borderlands team. The various patches of land that provide refuge for these animals will become “less viable, with less and less places for them to go”.

A July letter sent from U.S. Customs and Border Protection to a not-for-profit environmental group and seen by The Guardian describes the route and possible components of the project as including a 30-foot-tall concrete and steel wall, roads, and a 150-foot “enforcement zone” where all vegetation will be cleared.

With construction of the wall due to begin in February, people like Nicol fear that the barrier will not only destroy habitat and undermine ecotourism, but also lead to an increasingly deadly border as undocumented immigrants are pushed farther and farther into marginal and dangerous areas.

A U.S Border Patrol agent is seen near where executive director Marianna Wright walks along the National Butterfly Center on Tuesday, Dec. 11, 2018, in Mission, Texas. Photo by © Delcia Lopez

“This is not just that they will drive ocelots to extinction,” said Nicol, referring to the critically endangered wild cat found in the Rio Grande Valley. “Families trying to come into this country will be pushed into the desert to die.”

“Border walls are death sentences for wildlife and humans alike,” said Amanda Munro of the Southwest Environmental Center, an organization that works to restore and protect native wildlife and habitats. “They block wild animals from accessing the food, water and mates they need to survive. They weaken genetic diversity, fragment habitat, and trap animals in deadly floods. At the same time, they drive desperate asylum seekers to risk their lives in the unforgiving desert.”

For President Donald Trump, the new section of the barrier is making good on a campaign promise to build a “big beautiful wall,” a barrier that will add to the nearly 700 miles of walls and fences that already exist on or near the border. He argues that the wall is necessary for the nation’s security.

More than 200 species of resident or migrating butterflies make homes at the butterfly center throughout the year, including the vibrant Mexican bluewing, the tiny viceroy’s ministreak and the black swallowtail, which carpet the wild dill at the property with their eggs each spring. The center opened in 2003 and is the flagship project of the North American Butterfly Association.

“It’s going to cut right through here,” said Wright, showing where the wall will split the center’s property 1.2 miles from the border and cut off access to nearly 70 percent of its land.

Executive Director Marianna Wright stands on the banks of the Rio Grande River a mile south of the National Butterfly Center on Tuesday, Dec. 11, 2018, in Mission, Texas. Photo by © Delcia Lopez

Trump has expansive federal powers to construct the border wall on both private and public land. Since 2005, the Department of Homeland Security has had the power to waive numerous environmental laws in the name of national security.

And the federal government can, and has, used eminent domain law to acquire privately owned land for public use.

“We fully anticipate that they will seize the land by quick take,” said Wright, referring to a Depression-era provision of the eminent domain law that gives federal agencies the right to take property without compensation or adjudication. “Legal claims are not addressed or settled. You don’t get your day in court. You don’t get to negotiate appraisals or offers. Nothing."

(Delcia Lopez | For the Guardian) An employee at the center waters the native plants at National Butterfly Center on Tuesday Dec. 11, 2018, in Mission.

The president has threatened to use defense spending if his plans to build the wall were challenged. “If the Democrats do not give us the votes to secure our Country, the Military will build the remaining sections of the Wall,” Trump said in a tweet. The federal government went into a partial shutdown early Saturday over a budget impasse, with Trump seeking $5 billion for the border wall.

For Wright, this threat could mean the end of the butterfly center and enormous harm to its dozens of butterfly species and the threatened Texas tortoise, Texas indigo snake and Texas horned lizard that are also found there.

“It is truly a sight to behold,” said Wright, looking out from the bank of the Rio Grande River.

“They are violating our constitutionally protected rights, and that should terrify everyone,” she said. “Even if you don’t care about butterflies, you should care about this.”

This story is published in collaboration with The Guardian as part of its two-year series, “This Land Is Your Land,” with support from the Society of Environmental Journalists.