The Hornworm is the larval (caterpillar) stage of the sphinx moth, Manduca sexta. Hornworms are packed with calories and nutrients. A large Hornworm has the mass of approximately 20 crickets. If you need to put weight on your herp, Hornworms are a good addition to their diet. The 12ct. Hornworm cup from Timberline is shipped with enough food to allow the Hornworms to grow to full size. The 24ct. cup is shipped with enough food to grow the Hornworms to half their adult size. Either cup count option should reach its max in 7 to 10 days. Once the Hornworms arrive remove Hornworm waste from the cup daily to allow for proper airflow.