When bee finds a nesting tunnel in wood, plastic or some other material, the female bee will place mud inside the cavity to create the perfectly shaped cavity for her offspring. 

 

This photo shows two nesting tunnels (half of two nesting tunnels) containing two cocoons inside their mud cavities.  

When nesting trays are not completely snapped togethr, a gap is present and lets air into the nesting tunnel.  Consequently the mason bees muds over the gap  forming a super – wall.

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