In the Midlands in UK. Mostly Ruby Tigers (I think) but I also saw a Vapourer and a green thing which had been squashed but might have been an Angle Shades or something. It's like they all picked one day to make a mad break for it to the other side of the verge! There was no shortage of foodplants on the other side either. Something to do with the weather changing maybe, I thought? Like they all respond to the same temperature/humidity or something, maybe they felt like the first frost was coming and wanted to pupate? I don't know why they couldn't just do that on the side of the path they started on though. It wasn't in one isolated spot either, loads of them across a stretch of a km or so.
Thanks!
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source https://www.reddit.com/r/Entomology/comments/jicaav/why_did_i_see_so_many_caterpillars_crossing_the/
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