A gorgeously uncanny school of discus fish cluster in an aquarium, all of them captive breeds. Though there's nothing unusual about artificially selecting animals for flamboyant or bizarre traits, it's still compelling to see such a lovely display of manmade biodiversity. Some of these discus strains are the result of "natural" hybridization between fish from different geographic locations, while others are the result of random mutations and intense inbreeding.
Photo via Practical Fish Keeping.
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