Bee heads only
I opened one of my hives today to find about 200-300 dead bee heads lying on the top of the queen excluder. The lower brood boxes looked pretty normal. I’m in Denver Colorado and have never had any issues with hornets or pests. Could it be a sign of varroa die off? I should have taken a picture but didn’t have my phone with me. Has anyone seen this before? I can’t find much online about it.