Tomato hornworm

Manduca quinquemaculata, the five-spotted hawkmoth, is a brown and gray hawk moth of the family Sphingidae. The caterpillar, often referred to as the tomato hornworm, can be a major pest in gardens; they get their name from a dark projection on their posterior end and their use of tomatoes as host plants. Tomato hornworms are closely related to the tobacco hornworm Manduca sexta and Blackburn's sphinx moth Manduca blackburni.

This confusion arises because caterpillars of both species have similar morphologies and feed on the foliage of various plants from the family Solanaceae, so either species can be found on tobacco or tomato leaves.
Because of this, the plant on which the caterpillar is found does not indicate its species.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0