As I was cleaning some dead bees from the screen bottom board of one of my hives, I found 30-40 cell shaped clumps of pollen. I am pretty sure that its pollen because each one is a different color of orange or yellow, but they are the size and shape of a cell, not just little bits of pollen. Why would they throw that pollen out?
Thanks!
Pollen loses nutritional value as it gets older. They probably decided to replace it with fresh. It could also be contaminated with pesticides.
Michael, could they be making room for brood?
I'm not saying that they couldn't be, but they typically don't remove pollen, they consume it instead.