I purchased 5 hives in the fall and all seem to be doing well. All hives are double deeps. One hive had several(40-50) dead bees in front of it last weekend laying in the snow cover. Still plenty of bees coming and going from all the hives. I plan on putting in grease patties this weekend and wanted opinions on whether I should open the hives or not and should I be concerned with the dead bees or is this a natural condition?