The adult moth, sometimes referred to as a sphinx, hawk, or hummingbird moth, is a large, heavy-bodied moth with narrow front wings. The moth is a mottled gray-brown color with yellow spots on the sides of the abdomen and a wing spread of 4 to 5 inches. The hindwings have alternating light and dark bands. Eggs of the tomato hornworm are deposited singly on both the lower and upper surface of leaves in late spring.