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BiologyThe Netted Mountain Moth is single-brooded, and adults are active from late April to early June, although the precise time of emergence depends on the weather and the altitude. They fly in sunshine and are attracted to flowering moorland plants such bearberry (Arctostaphylos uva-ursi) (2). The eggs are laid in May, and the caterpillars are present from June through to August. They feed at night on bearberry, and spend the day hidden beneath leaves (3). Pupation occurs during August or September in dead leaf litter on the ground, and the adults emerge the following spring (5).