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 border in May. Uploading photos to the app helps identify plants and animals, and records the coordinates of the location.