Restoring agave for the Mexican long-nosed bat

A bat that depends on a single flower

Every spring, pregnant Mexican long-nosed bats (Leptonycteris nivalis) leave a mating cave in central Mexico and fly north, some traveling more than 700 miles, to reach a handful of maternity roosts where they will give birth and raise their young.¹ One of those roosts is Emory Cave, tucked into the Chisos Mountains of Big Bend National Park. It is one of only two known Mexican long-nosed bat roosts in the United States, which makes the stretch of desert around it disproportionately important to the species' survival.²

The bats make this journey for one reason: agave. Along the way, flowering agave plants provide the energy-dense nectar that fuels the migration and sustains nursing mothers. Without enough agave in bloom along the route, the bats simply cannot complete it.

An endangered species, and a disappearing food source

The Mexican long-nosed bat has been listed as endangered in the United States since 1988. Its population has declined by roughly half over the past few decades, driven largely by the loss of the agave habitat it depends on for food.³ Decades of overgrazing, agricultural expansion, unsustainable harvest, and drought have thinned out wild agave stands across the bat's migratory range, which stretches from central Mexico through the Trans-Pecos region of West Texas.

The relationship runs both directions. Agaves rely on nectar-feeding bats for pollination, and a single agave plant may take a decade or more to flower even once in its lifetime. When bats disappear from a landscape, agave populations lose one of their primary pollinators, and the plants that remain produce fewer of the offspring that would otherwise replenish the corridor.

Agave restoration site at CDRI

Restoration work in the Trans-Pecos

The Chihuahuan Desert Research Institute sits in the Davis Mountains near Fort Davis, Texas, in the same high desert region the bats pass through on their way to Emory Cave. It operates as an independent nonprofit nature center and botanical garden, headquartered on the campus of Sul Ross State University, and has long studied the restoration and revegetation of disturbed desert habitat as part of its research mission.⁴

That regional focus lines up closely with a partnership announced by Bat Conservation International (BCI) and Sul Ross State University, which established agave restoration efforts across the Trans-Pecos specifically to support the bat colony that uses Emory Cave. Dr. Kristen Lear, BCI's agave restoration program manager, has described Emory Cave as playing "an incredibly critical role in the species' survival."⁵

Agave blooming at CDRI

The work itself is patient, low-tech, and highly local: collecting seed from healthy wild agaves, propagating seedlings, and planting them back into the landscape at points along the migratory corridor where wild stands have thinned. Because each agave takes years to mature and flower, the payoff from a season of planting will not be visible for a decade or more, which is part of why sustained, long-term institutional involvement, of the kind CDRI and Sul Ross are positioned to provide, matters so much for a project like this.

Why this counts as rewilding

Agave restoration is a clear example of single-species-focused rewilding with cascading effects. Restoring the plant does not just support one bat species. Agaves themselves function as a keystone resource across the Chihuahuan Desert, feeding a range of pollinators and desert wildlife, stabilizing soil on slopes prone to erosion, and anchoring plant communities that other species depend on.⁷ Rebuilding the nectar corridor is, in effect, rebuilding a piece of desert ecosystem function that had quietly eroded over decades of habitat loss.

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