Life (root) » Animalia (Animals) » Arthropoda (Arthropods) » Hexapoda (Hexapods) » Insecta (Insects) » Pterygota » Hymenoptera (Ants, Bees, Wasps and Sawflies) » Apocrita (Wasps, Bees, and Ants) » Aculeata (Ants, Bees and Stinging Wasps) » Apoidea (Bees and Sphecidae) » Anthophila (Bees) » Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees) » Apinae (Honey, Bumble, Long-horned, Orchid, and Digger Bees) » Bombini (Bumble Bees) » Bombus (Bumble Bees) » Pyrobombus » Bombus sitkensis (Sitka Bumble Bee)