Here is more on bumble bees from my site:
Animal Teachers: Bumble Bee
Bumble Bees are large robust Bees with the color patterns of yellow and black. You can usually find Bumble Bees flying low to the ground or on flowers collecting food. They nest almost anywhere but only remain in one particular nest for a year.
Besides size, another way that you can tell how Bumble Bee is different from Honey Bee is that Bumble Bee's nest is a mess. Bumble Bees have fewer members in their colonies than Honey Bee. Also, They do not store large amounts of honey. Unlike Honey Bees, Bumble Bees rarely sting unless their nest is threatened.
Enjoy watching these fairly placid Bees as They go about their business of pollinating the flowers. Learn from Them to mind your own business. Just do not be messy in your affairs.