a calliphoridae carrion fly rubbing hands on a leaf

green insect invertebrate animal leaf flower arthropod nature beetle fly pest yellow plant petal bee calliphoridae family flies commonly blow blow-flies carrion bluebottles greenbottles cluster adults shiny metallic colouring blue black thoraces abdomens species neotropics scavenger insects lay eggs dead animals larvae feed decaying tissue efficient disease vectors dysentery observed maya biosphere reserve mbr petén guatemala rubbing hands