Zone 4 Langsthroth mostly.
This is my 4th winter, and I have had losses every year. The first 2 years I was suspecting mites and or starvation. It would be helpful if someone could explain presentations of various causes of death (mites, starvation, queen issues, freezing, ventilation etc...) A description (and bonus for pictures) of what each cause looks like i.e. bees head first into combs, spread out, other visual cues- would be extremely helpful. I found one dead out today, and suspect queen failure and freezing, but I can't be sure. Any and all help would be appreciated!