Dufour’s gland is an organ found in a variety of insects that performs a variety of functions. The function of the secretions varies among species and orders. Dufour’s gland secretes a combination of chemicals and pheromones. Depending on the specific insect and the situation these secretions are used to waterproof brood cells, feed larvae (when mixed with pollen and nectar), or communicate. Ivy bees use their Dufour’s gland to weatherproof their nests.