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The caterpillars that feed on trees are trying to match the hatching of their eggs to the timing of bud burst. The caterpillars want to feed on the juiciest and least chemically protected leaves. And it's not just the caterpillars, of course, that are important. But the knock-on effect is on nesting birds, which are also trying to hatch their chicks at the same time that there's the maximum number of caterpillars.

Historically what has been used to estimate bats has been photographic estimates, visual estimates, mark-recapture estimates, and those have been highly prone to bias. Newer technology, like thermal imaging cameras is accurate, but expensive. So at a time of epic bat mortality-due to, for example, the fungal white-nose syndrome that's wiping out bats in Canada and the U.S. Kloepper says her method might be a cheap, reliable way to determine the most critical caves to save.