That's what you look for. Cluster size and are they in contact with honey. My bees in NW Vermont have had several cleansing flights this winter. They're out pooping even when the temperatures are in the 30s. Probably wrapping in black felt paper helps elevate the temperatures in and around the hive. Lots of yellow snow, and very few bees dead outside.I'm thinking of cracking them open to see what's going on but don't think I even know what to look for other than bees and honey on the frames.