I have a hive in my backyard in the city, which didn't make it through the winter. I put a 3lb package in last week and they seem to be doing great. But it looks like they are removing pollen from some comb and tossing it out the front. I observed several pieces laying around the front and watched a bee drag some out this morning and dropped it. I think its pollen, but not really sure. Anyone seen this before?