California almond grower Glenn Anderson’s orchard has provided shelter and breeding areas for bats for years.

While he was trying to formulate his theory on how much work the bats were doing, Devaughn Fraser, a researcher from UCLA, decided to study the bats on his farm, trying to define their value.

Another researcher, Katherine Ingram, has also been running a study for the past two years in an attempt to put a monetary value on what she calls “the ecosystem services” provided by the bats.

With her research designed on walnut groves in central California, Ingram used sound recorders to record the various echolocation calls the bat emits they are seeking their prey.

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