My neighbor and I are novice beekeepers. We have one hive, combined from about a month ago. Bottom brood box has a good looking queen, a good amount of brood, and many bees. Super on top of the brood box, has lots of capped honey, and super on top of that has only one full honey tray, but they are drawing out comb on about 3 other frames. We've recently found a handful of bits of pollen on the ground out front of the entrance, which is the first we've ever seen of that. Any ideas why they'd be putting the pollen out? Thanks for any ideas.