Norbert Wu / Bumblebee (Bombus sp) collecting pollen from a daisy, California

Michael Durham / Bumblebee (Bombus huntii) with full pollen baskets, flies from a Rhododendron flower, northeast Oregon

Michael Durham / Bumblebee (Bombus huntii) flying toward a Rhododendron flower, northeast Oregon

Tim Fitzharris / Buff-tailed Bumblebee (Bombus terrestris) on flower, Rocky Mountains, Colorado