Ernie Schmidt wrote:Edwin,
I don't have Dropbox so I haven't heard the knocking you refer to. After reading the further posts here I definitely agree that there is a plunking/plinking noise bees make hitting the screen on screen bottom boards. When I slide my bottom boards out from under the screens to inspect for mites I can hear the bees hitting the screen. It's not a lot of hits, it does have a particular sound, and it calms down quickly. I think the bees just feel something has opened the bottom of their hive and come flying down to see what it is.
Ernie
I was thinking about this issue this week. I think I will slide the bottom board back into the hive. (I removed it because of the summer heat in my NC climate.) I hope that will help them (also) encourage building comb into the bottom box.
Also, I noticed that the bees don't seem to have guards at the entrance of this hive. Or if they do, they are not there consistently.
Bees are pretty smart so maybe I am just being a human and doing unneeded things. But I don't see how my proposed steps could do anything but to make them calmer and more secure.
PS: Dropbox is just a storage place for files. You should be able to go there and download the sound file somewhere that you can listen to it.