Documentation of the biology of the genus Bombus including seasonal social and ecological pressures. After the passage of winter the fertilized queen starts a new colony. She collects nectar and pollen and looks after the nest until the first worker pupates. The film documents the subsequent food collection and storage, oviposition, growth of the nest, feeding of the young workers and the first males, nectar flights of the drones, copulation, hibernation of the young queen and leaving the nest in autumn.