closeup on a vestal cuckoo bumblebee, bombus vestalis sitting on a purple knapweed flower

arthropoda arthropod asteraceae bee bombus vestalis centaurea jacea cuckoo bumblebee flora hymenoptera insect nature plant psithyrus vestal animal biology botanical botany brown knapweed brownray cleptoparasite closeup daisy family entomology flower flowering invertebrate macro outdoors parasite pollinator single solitary wild wildflower wildlife