Mason Bee House Update - (Some) Cavities Filled

Back at the end of April, I posted a photo of the new Mason Bee House that my sister gave me for my birthday.  I hung it on our fence, on the north fence line down in the low spot of our yard - which due to the swails/drainage means that's the spot that has the most moisture.  Hence...access to mud.  It also gets morning and mid-day sun.

Which are all the components for a good placement (access to mud, stable location and partial sun) of a Mason Bee House.

And, much to my surprise, I've found that the house is being occupied!  Yeah...at least some of the chambers are filled.  Look closely at the photo above, you'll see some of the bamboo cavities are filled with mud.  That means there's larvae behind them.

Here's a marked up version of the house showing the filled chambers.

I count 14 little bees behind mud and based on what I read online, these things will live inside those chambers for close to a year and will emerge in the Spring of 2019.