This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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The Firefly Lab
lets-firefly.bsky.social
did:plc:2z5xopoe33u52fgjib536axc
Map by Josh Katz. I do not know how the data was collected and compiled, but the trends match what I have heard myself going around the US. (Although "fireflies" remains very common even in the southeast.)
2025-01-12T23:24:30.154Z