Viewing nest- observation nest

This is the 3-hole Beediverse Observation Nest.
Leafcutter bees are present in the left hand nesting tunnel.  The
remaining two nesting tunnels  are occupied by mason bees.
A thin film of acetate sits on top of the tunnel and below the lid.

"Spring is herei was walking around checking the honey beez and checked the masonic beez to see how they were doing.  i was wondering what i did with my small observation hive......couldn't remember at first, then there it was, about eye level right in front of me.  Duuuuuu.  i had done nothing with it last year.  forgot about it entirely......" Cal M.