Some Solitary Bees like Resin Bees will create their nest in small tunnels or grooves and for most of us it’s a mystery what happens inside the tunnels. This observation block allows the nests to be easily viewed without causing any disturbance or damage.
Using Cypress I’ve routed grooves 160mm long in a 200mm wide block. I then covered the surface with some clear acrylic sheet and placed a hinge on the back.
When it’s in place the blocks are closed against each other. The block could be placed flat/horizontally or vertically. I would suggest once the bees have started creating brood cells that you make sure it’s returned to the same exact location and position. The brood cells may be affected if you change the position.
When i want to have a peek i can open up the blocks without disturbing the nests…
Update photo below: 29/09/2019
Below: Some activity!!
Update photo below: 04/01/2020
Below: This looks pretty successful to me. I didn’t realise, but there’s two different species of Resin Bee using this block. Large and small… (‘ll have to find out the species)
Below: The larger Resin Bee, it’s brood cells and larvae taking up the whole tunnel
Below: The smaller Resin Bee, taking up less space in the tunnel and leaving an access track underneath the brood cells / larvae.
Below, you can see the different development stages between the cells