Simcoe County Bird and Nature Board.
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Re(1): yellow caterpillers what are they?? Posted on June 19, 2017 at 02:37:53 PM by Bob Bowles
Hi Bonnie;
They sound like sawfly larvae and not caterpillars of moths and butterflies from your description. Do you have a photo. My best guess would be Web-spinning Sawfly Larvae - Neurotoma fasciata until a see a photo. Record also the host tree species that they are on. Replies: