The Queen decides babies’ gender.
A Queen bee has the power to decide if her eggs will grow into males or females.
Bumble bees visit the same stretch of flowers daily if nectar and pollen are available. This bodes well to a spring and summer seeing Bumble bees.
After the House Sparrow took over the bluebird nest, I cleared the old bluebird nest and left the box open for a few days. I close the box again Saturday and the bluebirds were claiming the box again.