Bombus dahlbomii is a species of bumblebee endemic to southern South American temperate forests. B. dahlbomii is one of the largest bee species in the world, with matured queens growing up to 40 mm (1.6 in) long. Because of its size and furry appearance, the species has been described as "flying mice" and "a monstrous fluffy ginger beast". B. dahlbomii is an important insect in local ecosystems, such as the Maulino forest of central Chile. There, it is a major pollinator of native plants such as Lapageria rosea and Alstroemeria aurea, both of which serve important commercial purposes.