Are very important to have around these days, as the bumble bee population is threatened then they need every help they can get. The bumble bee nester is a very well constructed box made from durable thick (FSC) timber (Cedar / Larch / Alder). The roof overhangs and will keep rain off the walls, the roof also slides to allow inspection of the bees. Ventilation holes provide a good flow of air . The nester comes with some natural nesting material for the mammals or bees to use.
Bumble Bees are not agressive and do not pose a threat to us humans, however they will sting if they are in extreame danger. So if you leave them to their business and only look at them now and again, keeping a discrete distance and not interfering with them, they will be an asset to your garden and safe for all of the family.