Adults are called Hawk Moths or Sphinx Moths
The entire life cycle
Eggs can easily be seen with the naked eye.
Hornworms are often parasitized by Apantales spp. parasites. By the late summer, over 90% of the larvae are parasitized.
The tobacco hornworm develops seven straight oblique whitish lines laterally. The white lines are edged with black on the upper borders, and the "horn" is usually red in color. The tomato hornworm is superficially similar, but instead of the seven oblique lateral bands it bears eight whitish or yellowish "V"-shaped marks laterally, and pointing anteriorly. The "V"-shaped marks are not edged in black. Also, in tomato hornworm the "horn" tends to be black in color. Their distribution is also a little different. The tobacco hornworm is more common in the southern United States, especially the Gulf Coast States. Its range extends northward to New York. The tomato hornworm, in contrast, is uncommon along the Gulf Coast, but relative to tobacco hornworm is more likely to be encountered in northern states.
Tomato hornworm adult (above, left) versus tobacco hornworm adult (above, right). Very similar looking except that the tomato hornworm has 5 orange-yellow spots on its abdomen (the last one is not clearly visible in the picture above) while the tobacco hornworm has 6 orange-yellow spots (again, the last one is not clearly visible).