Top Photo: Elm Sphinx caterpillar on elm. Each summer I come across a large green caterpillar in an elm tree overhanging the boardwalk in Explore the Wild, an elm sphinx moth caterpillar (Ceratomia amyntor). This species is also known as four-horned sphinx (tobacco and tomato hornworms are sphinx moths). The elm sphinx I see each year is always in the same elm tree, but I’ve never seen the adult, until this spring. Most adult sphinx moths are cryptically colored inRead more