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eristalis tenax
colletes
silphium perfoliatum
rudbeckia nitida
syrphidae
helianthus tuberosus
apis mellifera
helianthus annuus
syrphid fly
western honey bee
megachilidae
helianthus occidentalis
bee in the approach
arnica montana
pollina
pollinators
hoverflies
pollination
pollino
rudbeckia nidita
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