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BiologyThe Narrow-bordered Bee Hawk-moth has a single generation each year (it is 'univoltine'). Adults are active in the day between mid-May and mid-June, and can be seen visiting the flowers of various species in sunshine (2). Eggs are laid singly underneath leaves of the foodplant, and hatch 1-2 weeks later. Caterpillars feed between July and August but are hard to find (5), and will fall to the ground when disturbed. The pupa overwinters in a cocoon spun below the surface of the soil (3).