Thanks in advance for any suggestions.
When it warmed up a bit last weekend, I went to check the hive. I had previously checked them briefly on a warm day in February just to make sure they were alive, and they were. This time I found dead bees everywhere: dead bees on the top, in the bottom, and even still clustered together between frames. Very few bees were found head first in the cells although a few were. Plenty of honey even right next to dead bees.
I don't think it was starvation. Was it moisture content? Was it mites? How could I tell? Something else?
Sorry if these are elementary questions, but I don't want to make the same mistake twice.