Yesterday my sister came in the house and told me, "One of your hives has a ton of bees on the front of it, and they don't sound very happy." I went out to the apiary and she was right, this one hive had bees running around all over the face of the hive. It was like they were freaking out about something, but there was no fighting, no robbing, and nothing seemed amiss. All the other hives in the apiary were acting completely normal, just traffic going in and out, some orienting, some fanning, but this hive looked like this (I took a short video).
I was in the middle of something, so I couldn't sit and watch them for long, and when I came back out to check on them about a half an hour later, everything seemed normal again. What do you think they were doing?