yeah they are wax moth larvae. if the bees have more room than they can defend you could shrink them down to a defendable size. them bieng on the bottom board may mean that the bees are cleaning them out of the equipment, especially if this is a newly installed nuc or package. any equipment you have should be inspected pretty quickly so your comb doesn't get ruined. the safest place for drawn comb is in a healthy hive, but since thats not always possible do a search for wax moths on here. there are several options ranging from toxic chemicals, nontoxic chemicals, biological controls, to storing them in the open which makes them unattractive to moths, but not mice. hope that helps. justin