Hornworms are typically shipped small around 1/4 inch to 1/2 inch in length. Allow Hornworms 5-7 days after arrival to grow to a good feeding size. Hornworms ship small because large hornworms consume a lot of food in a very short period and soil the cup. Hornworm Cup Care Guide: Temperature: Keep the cup at room temperature, around 72-80°F (22-27°C). Avoid extreme temperatures as they can harm the horn worms. Ventilation: Ensure the cup has holes or a mesh for adequate airflow. Stagnant air can lead to mold growth and unhealthy worms. Humidity: Maintain moderate humidity inside the cup. If it's too dry, worms may dehydrate; too wet, and it could foster bacterial growth. Cleaning: Remove frass (waste) regularly to prevent mold and bacteria. This will also reduce odors and maintain a healthy environment for the worms. Handling: Be gentle when handling hornworms. Use soft tweezers if necessary to move your blue-horned worms and to avoid injury.