The last two days I went out to nab a couple of bees for bvt. 2-3 weeks ago, when I put on the popsicle sticks they were very obviously in the top hive. Now they are in the bottom hive or at least some of them are. And they were not happy to see me today, assertive but not aggressive. Why would they be in the bottom hive this time of year. A little warmer weather maybe?