This is really a small question to satisfy my curiosity. Since the temps have dropped here on the west coast, I am finding anywhere from 10-40 bees that are dead or dying stuck to my sticky board when I check for the mite drop. What would cause them to go there? Are they likely bees from that hive or would-be robbers? While there may have been 1 or 2 bees on the board during the summer, it was nothing like this. Ant thoughts? I switched from Vaseline to Pam canola oil on the board in the past month... A factor?