The bumblebee family, as well as the wasp family, exists only one summer. In spring, the queen begins to look for a place for a nest. An abandoned mouse mink, a moss bump, a hollow, a squirrel’s nest, a birdhouse, are all suitable for this purpose. Having covered the nest with dry grass or moss on the outside, the queen makes the first round wax cell inside. In the cell, she places a small supply of food — a mixture of flower pollen and honey — and makes several eggs. Then she builds the others. Meanwhile, in the first cell, the larvae hatch. When they eat the food supply, the female gnaws a hole in the cell through which she feeds them.
After a week and a half or two weeks, the larvae begin to weave silk cocoons and turn into pupae. Then small working bumblebees are born and they begin working immediately – build cells and feed the larvae.