I have 3 hives that all have top and bottom entrances. There is one with a smaller top entrance at 1" wide by 3/8" tall. None are really using the bottom entrances now as they are packing in the pollen, hard and fast. So much so that I am noticing that when 4 pollen packed bees are trying to get in, they are pushed off the edge by a huge rush of bees coming out.
Should I change this shim with a bigger entrance? But we do have below freezing weather on its way and possible snow and if they are brooding up, I don't want them to get chilled because of me.