Did you know that more than 95% of bee species are solitary?
These bees do not have a queen, do not live in groups, and do not produce honey. Many of them do not have a stinger and most are not aggressive. Solitary bees are perhaps one of the best pollinators we have.
The refuge for solitary bees creates nesting spaces in cities and promotes the conservation of native bees.
You just have to put it on your terrace, patio, balcony or garden and wait for the bees to nest. But if you plant species of plants native to the place where you live, you increase the probability that they will make your refuge, their lair.