Botanists are scouring the US-Mexico border to document a forgotten ecosystem split by a giant wall

Near the towering border wall flanked by a U.S. Border Patrol vehicle, botanist Sula Vanderplank heard a quail in the scrub yelp “chi-ca-go,” a sound the birds use to signal they are separated from a mate or group.

Then silence.

A quail on the Mexican side called back, triggering a back-and-forth soundtrack that was both fitting and heartbreaking in an ecosystem split by an artificial barrier.

Vanderplank was among several botanists and citizen scientists participating in the Border Bioblitz near the Mexican community of Jacumé, about 60 miles (100 kilometers) east of Tijuana.

Roughly 1,000 volunteers armed with the iNaturalist app on their smartphones are documenting as many species as possible along the U.S.-Mexico border in May. Uploading photos to the app helps identify plants and animals, and records the coordinates of the location.

The hope is the information could lead to more protections for the region's natural richness, which is overshadowed by news of drug trafficking and migrant smuggling.

On a recent day, Bioblitz volunteers scrutinized a bright yellow blooming carpet of common Goldfields, a sharp contrast to the imposing steel bollards of the border wall topped with rolls of razor wire. Some navigated their way around piles of empty water jugs, a gray hoodie and empty cans of tuna fish left under the branches of native flora like the Tecate Cypress.

“There’s a fabulous amount of biodiversity here that’s traditionally been overlooked,” Vanderplank, of the binational program Baja Rare, said.

The efforts started in response to former President Donald Trump adding hundreds of miles of border walls that toppled untold numbers of saguaro cactuses in Arizona and passed through the biodiversity hotspot of Baja