Also if you go to the Midwest US, they're still everywhere in the summers. I assumed the firefly deaths would be easily explainable by chemicals, but they seemed prevalent over soybean fields (which would be treated with pesticides at some point), not just open (no chemical) pastures.
Source: the sad death chamber of a jam jar of fireflies my youngest collected this year at a family get-together on the family farm. So it's pretty anecdotal, but they were everywhere along the highway as we drove there as well for like 2 whole states.
Source: the sad death chamber of a jam jar of fireflies my youngest collected this year at a family get-together on the family farm. So it's pretty anecdotal, but they were everywhere along the highway as we drove there as well for like 2 whole states.