Bees
 

I have some bees living in a hole in my garden (not really a hole in the
garden more a crack in a slab through which, I assume, they gain
entrance to the ground). There are not enough to be honey bees but
there seems to be more than one "family" How frequent do solitary bees
stay in the one location with other solitary bees i.e. using the same
entrance but different 'cells'. Could this (5 or 6 bees)be bumble bees
(fuzzy bombers) and are they as good for the plants, pollination etc, as
honey bees appear to be from what I have read in this newsgroup?