I was surprised to see so many tubes sealed (it’s on its second year but it looks like we missed the window to swap in the replacement tubes I’d made). If you spot any other issues please let me know.
You could add a mesh 1 cm in front of it so birds can not get to the eggs/larvae.
Mark your calendar to swap out the tubes for new ones in early summer to help prevent disease and parasites (it sounds like you’re aware of this, but leaving the comment just in case): https://news.vt.edu/articles/2020/03/ext-entomologists-tips-for-installing-and-maintaining-native-bee-houses.html
What’s a bee house? I thought bees lived in hives.
The bees most people are familiar with do live in hives, but as far as I know, there are more bee species that do not.
Yeah there are a bunch of species of solitary bees that nest in holes they find or make - this was partly an attempt to protect carpenter bees from trying to nest in my parents’ house, in addition to providing shelter for pollinators