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BiologyThe adults are on the wing in May and June and are largely crepuscular (7). They rest in long grasses during the day from which they are easily disturbed, sometimes flying naturally on warm, dull days (8). Caterpillars hatch from the eggs laid by the adults; they are present from July to May and hibernate through the winter, emerging the following spring when they pupate (2). The adults then emerge, starting the cycle again. This type of lifecycle is known as 'single brooded' or 'univoltine', as only one generation (or 'brood') is produced in the year.