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The Darwin fish is a parody of the ichthys, the "Jesus fish". It is an ichthys that has "evolved" legs (and optionally, has the word "Darwin" written inside). It is a symbol for the belief in evolution.
Most Darwin fish are plastic and chrome adhesive badges applied to the rear of cars.
The Darwin fish has led to other fish badges, including a large fish labeled "Truth" eating the Darwin fish, a Linux shark, a dead fish labeled "Gefilte", and a flying saucer labelled "Alien."