Gustav the caterpillar.

Gustav is a caterpillar character from Sesamstrasse, the German co-production of Sesame Street. Gustav is Rumpel's pet caterpillar who lives in his rain barrel. He is the only character Rumpel shows his soft-natured side to.

Gustav doesn't speak. Gustav was added to the Sesamstrasse cast in the 2000s. He was based on Oscar the Grouch's pet worm Slimey.

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