Photos from the cleaning of the condos.

Above is a photo of an opened bamboo tube (black bamboo)

Basically, I just split the tube at the end and pry it open. Actually, very simple to accomplish. 

The only real problem is when a cocoon is stuck in the very back of the tube. That  one can be difficult to extract.  It only occurs for about 1 in 50 cocoons.  The

big problem is parasitic wasp and fly larvae. The parasites actually destroy cocoons.

Above is an example of an empty tube.

Above is an example of a destroyed cocoon. I suspect it is some kind of fungus.