Look for Red-spotted Purple Admiral butterflies from spring through autumn. Adult butterflies drink nectar from flowers, water from puddles, tree sap and juices from rotting fruits. They are likely to be found on or near host plants for their caterpillars. Caterpillars eat the leaves of willow trees as well as poplar, cottonwood, deerberry and black cherry. White eggs resembling tiny spiky golf balls are laid at the edges of leaves and the caterpillars eat away at the soft parts of the leaf once they hatch. The caterpillar resembles bird droppings. It is white and green with two yellow bumps near the head and two smaller yellow humps near its rear. When ready to pupate, it uses feces to attach its cocoon to rib of a chewed leaf. Depending on the latitude, Red-spotted Purple Admirals can produce two to three broods a year.