Nearly two decades ago, scientists made an alarming discovery in upstate New York: Bats, the world’s only flying mammal, were becoming infected with a new, deadly fungal disease that, in some cases, could wipe out an entire colony in a matter of months.

Since then, the disease — later called white-nose syndrome — has spread across much of the country, utterly decimating North American bats that hibernate in caves and killing over 90 percent of three bat species. According to some scientists, WNS has caused “the most precipitous wildlife decline in the past century in North America.”

These declines have clear consequences for human populations — for you, even if you don’t like bats or visit caves.

Bats eat insect pests, such as moths and beetles. And as they decline, farmers need to spray more pesticides. Scientists have linked the loss of bats in the US to an increase in insecticide use on farmland and, remarkably, to a rise in infant deaths. Insecticide chemicals are known to harm the health of newborns.

The only reason we know any of this is because of a somewhat obscure government program in the US Geological Survey (USGS), an agency nested within the Interior Department. That program, known as the Ecosystems Mission Area, is the biological research division of Interior. Among other functions, it monitors environmental contaminants, the spread of invasive species, and the health of the nation’s wildlife, including bees, birds, and bats.

The Ecosystems Mission Area, which has around 1,200 employees, produces the premier science revealing how animals and ecosystems that Americans rely on are........

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