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Mourning Cloaks mate in early Spring. Females lay eggs on a host plant. A host plant is the plant that caterpillars need to eat. Every butterfly has only certain plants it will eat. Mourning Cloak caterpillars eat willow, American Elm, poplar, hackberry, wild rose, and hawthorns. They are most often seen on Black Willow. Eggs are laid in groups. They are pale yellow at first. Then they turn red, then black before they hatch.
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