“By compiling and analyzing a huge amount of government data, environmental economist Eyal Frank, the study’s sole author, discovered that in regions with outbreaks of white nose syndrome, a wildlife disease that kills bats, the rate of infant mortality increased by nearly 8 percent relative to areas without the disease.
There’s a clear reason for this, according to the paper. Most North American bats eat insects, including pests like moths that damage crops. Without bats flying about, farmers spray more insecticides on their fields, the study shows, and exposure to insecticides is known to harm the health of newborns.”
https://www.vox.com/down-to-earth/370002/bats-link-babies-death-study-white-nose-syndrome