i've seen big bumblers flying/hovering around, but i haven't seen anyone use the house yet. i hope the holes aren't too small. :-(
turns out my holes were way too big. i looked up schematics after not seeing anyone flying in or out, and it turns out i greatly overestimated the sizes needed. (i was using japanese knotweed stems. waaay too big.) the pictures of the reeds and stuff looked deceptively large when i was first researching. oops! well, we put up a new house with the right sized reeds today. oh well. i hope it's not too late for summer bees to decide to move in. unfortunately the boysenberries are almost done with their blooming, and that's where the houses are. right above those. *sigh*
mr carrot was looking at some bee house designs today, and there was one that was made with a sturdy cage around it to keep the birdies out. (or at least so they can't peck as deep.) maybe we'll build one of those for next year. we definitely have red bellied woodpeckers living across the street, so they'd probably think the bee house is a buffet.