Gadira acerella is a moth in the family Crambidae. It was first described by Francis Walker. It is endemic to New Zealand and is found throughout the country. The species inhabits native forest from sea level up to subalpine altitudes. Larvae are assumed to feed on lichen or moss. Adults are on the wing from October until March, are active at night and are attracted to light. This species is distinctively patterned and coloured and is said to resemble a bird dropping at rest. The colouring also assists to camouflage the moth when it rests against lichen.

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