Bumblebee
Fertilised queens overwinter in a dormant state. They start a nest in the Spring. The nests are smaller, usually much smaller, than those of hive bees. The queen stores sperm from her mating, and can decide whether or not to fertilise an egg as it comes down the oviduct to the vagina. The females are diploid, the males are haploid. This is the common method of sex determination throughout the Hymenoptera.