Thyra runs the Pollination Program for Rent Mason Bees. They are the largest solitary bee provider in the country. You release bees and rent their nesting blocks that are then sent back to them in the fall and they will do all the maintenance and cleaning for you to remove predators that are harmful to solitary bee populations. Last year they cleaned over 3 million mason bees cocoons and 40 million leafcutter bees, ensuring healthy bees are returned back to their habitat and clean nesting material is put out for them every spring.