What do bees like about bird feeders?
 
Since there is nothing else available, the filed bees treat the cracked corn
like pollen, and try to bring it home to their colonies.  If you were to look
in front of your hives, you will probably find a pile of cracked corn that the
field bees brought home and the house bees promptly threw out.
 
W. G. Miller
Gaithersburg, MD