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Karner Blue Butterfly facts

Karner blue butterflies are small, blue butterflies having a wingspan of 22 to 32 millimeters (approximately .87 to 1.26 inches).
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The butterflies usually have two broods each year. Eggs that have overwintered from the previous year hatch in late April. These larvae feed on wild lupine leaves and mature rapidly, pupating in May, with adult butterflies usually emerging later in the month.

Adult Karner blue butterflies typically are in flight for the first 10 to 15 days in June. Females lay eggs, which hatch in about a week. The larvae feed for about three weeks before they pupate.

Adults from the second brood usually appear in the second or third week of July and die by early August.

Before the adult females die, they lay eggs that hatch the following spring.

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