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a species of butterfly native to eastern North America. It is one of the most familiar butterflies in the eastern United States, where it is common in many different habitats and travels as far North as Winnipeg Manitoba, Canada. It flies from spring to fall, during which it produces two to three broods. Adults feed on the nectar of many species of flowers, mostly from those of the families Apocynaceae, Asteraceae, and Fabaceae. P. glaucus has a wingspan measuring 7.9 to 14 cm (3.1 to 5.5 in). The male is yellow with four black "tiger stripes" on each forewing. Females may be either yellow or black, making them dimorphic. The yellow morph is similar to the male, but with a conspicuous band of blue spots along the hindwing, while the dark morph is almost completely black. The green eggs are laid singly on plants of the families Magnoliaceae and Rosaceae. Young caterpillars are brown and white; older ones are green with two black, yellow, and blue eyespots on the thorax. The caterpillar will turn brown prior to pupating. It will reach a length of 5.5 centimetres (2.2 in). The chrysalis varies from a whitish color to dark brown. Hibernation occurs in this stage in locations with cold winter months. The wingspan ranges from 7.9 to 14 cm (3.1 to 5.5 in) with females being the larger sex. Southern individuals are larger than northern ones. Males are yellow with four black "tiger stripes" on each forewing. The outer edge of the forewing is black with a row of yellow spots. The veins are marked with black. The postmedian area of the hindwing is black with yellow spots along the margin. The inner margin of the hindwing has small red and blue spots. The ventral forewing margin has a yellow bar that is broken into spots. This broken bar is present in both sexes, and is used to distinguish P. glaucus from its close relatives. Females are dimorphic. The yellow morph differs from the male in having a blue postmedian area on the dorsal hindwing. In the dark morph, the areas that are normally yellow are replaced with dark gray or black. The bluish postmedian area on the ventral hindwing has one row of orange spots. A shadow of the "tiger stripes" can be seen on the underside of some dark females.
Hadley Valley Preserve is former farmland that has been restored to mostly native prairie with some clumps of shrubs and forest. There is a nice size creek bisecting it. The 807-acre Hadley Valley was acquired between 2000 and 2014. The preserve is part of the Spring Creek preservation system, which conserves more than 2,000 acres. Hadley Valley protects a diversity of habitats, including forest, savanna, wetland and a portion of Spring Creek. Wildlife found at the preserve includes more than 15,000 species of insects, birds, aquatic invertebrates, fish, mammals, amphibians and reptiles. The preserve is also home to a variety of plant species, including tall swamp marigold, wahoo, great angelica, yellow avens and shingle oak. The site is managed with invasive species control, prescribed burning, native species establishment and soil stabilization to protect and enhance its natural resources. The preserve is the location of the largest restoration effort in the District’s history — a stream de-channelization, wetland restoration and wildlife habitat restoration project in 500 acres of the preserve — performed in partnership with the Illinois State Toll Highway Authority, Openlands, U.S. Army Corps of Engineers, and the O’Hare Modernization Program.