Phoenix Zoo researchers say a fast moving push to expand border barriers across southern Arizona is putting some of the region's rarest wildlife on the line. They warn that the work could erase species that live only at Quitobaquito Springs and trap larger mammals that rely on cross border corridors. The zoo points to a secondary barrier project through Organ Pipe Cactus National Monument and separate construction in the Pajarito Mountains west of Nogales as immediate threats to tiny springsnails and pupfish, along with the bigger animals that have been showing up on the zoo's cameras. Conservationists describe Quitobaquito and the surrounding sky island ranges as fragile places where even small hydrological or landscape changes can trigger outsized ecological consequences.
As reported by KJZZ, Phoenix Zoo staff say a more-than-$600 million secondary barrier would run roughly 23 miles through Organ Pipe and that the edge of Quitobaquito Pond sits about 200 feet from the existing wall. Tara Harris, the zoo's conservation director, told KJZZ the zoo maintains about 4,000 Quitobaquito tryonia in human care and fears construction "could wipe the species from the wild." The zoo also warned crews have begun work near the Pajarito study area, where its field team uses camera traps to document wide ranging mammals.
Tiny Species, Big Risk
The U.S. Fish & Wildlife Service proposed listing the Quitobaquito tryonia as endangered in 2023 and sought to designate roughly 6,095 square feet of critical habitat inside Organ Pipe, underscoring how narrowly distributed the snail is, according to the U.S. Fish & Wildlife Service. Quitobaquito Pond is also home to the Quitobaquito pupfish and the Sonoyta mud turtle, which represents the only known U.S. population of that turtle, so any sustained drop in spring flow or contamination could be catastrophic for those animals, as National Geographic and federal records have documented. Scientists say springs are uniquely vulnerable to nearby construction, groundwater withdrawal and changes to surface drainage.
Cultural Damage And Federal Waivers
The buildout is moving ahead under an expanded use of federal waiver authority that lets Homeland Security proceed without some standard environmental and cultural reviews, a legal shift that critics say speeds work across sensitive lands. The Washington Post recently reported that contractors bulldozed an ancient Indigenous intaglio in the Arizona desert, an incident that has amplified concerns about whether safeguards are being followed. Conservation lawyers say those waivers make it harder for courts and the public to pause or modify high risk construction in time to prevent harm.
Corridors Cut, Genetics Threatened
Biologists warn that continuous, impermeable barriers fragment habitat and block the cross border movement animals need for foraging and breeding, which can accelerate inbreeding in small populations. Tucson.com noted that a Mexican gray wolf recently crossed into Mexico through one of the few remaining gaps, a trip that experts say could be blocked if more long stretches are sealed. For species already reduced to only a handful of individuals in the United States, losing that connectivity can push recovery plans off the rails.
Zoo Science On The Front Lines
The Phoenix Zoo runs field camera programs across the Atascosa-Pajarito complex and has maintained captive breeding programs for desert pupfish for years, work that conservationists now fear could be compromised. The zoo's field research blog documents camera captured records of ocelots, jaguars and black bears in the same corridors where new barriers are planned, and the zoo's conservation pages note an ongoing breeding population of desert pupfish kept in human care. Those local data are the sort of evidence researchers cite when arguing for routing changes, avoidance measures or stricter mitigation around springs and travel corridors.
Conservation groups and reporting by outlets like National Geographic have documented periods when construction related pumping and heavy equipment coincided with sharp drops in Quitobaquito's pond levels, raising alarms that even indirect hydrological impacts could spell disaster for the springs' specialist species. The Center for Biological Diversity has also cataloged declines and urged protective measures, saying past wall work has already stressed the oasis and cultural resources. Scientists caution that in arid landscapes, small changes to groundwater or surface flow often produce outsized biological effects.
Phoenix Zoo leaders say their concern is practical and immediate: these are irreplaceable animals and a culturally important place, and the pace of construction leaves little margin for error. As KJZZ reported, U.S. Customs and Border Protection told reporters it would not use groundwater within five miles of Quitobaquito Springs but could not confirm whether a secondary barrier is already under construction between the pond and the existing wall. For nearby communities and the scientists watching Organ Pipe and the Pajarito ranges, the coming weeks of construction, agency notices and any legal filings will be decisive for whether those species survive in the wild.
