Most species live in small colonies, usually underground, often in an old mousehole.
The queen lays her eggs in a hollow nest of moss or grass at the beginning of the season. The larvae are fed on pollen and honey, and develop into workers. All the bees die at the end of the season except fertilized females, which hibernate and produce fresh colonies in the spring. Bumblebees are found naturally all over the world, with the exception of Australia, where they have been introduced to facilitate the pollination of some cultivated varieties of clover. This is due to a number of factors, including intensive agriculture, reduction in hedgerows, and competition from honeybees.