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From NBC:
Some very colorful lobsters have turned up at Norwalk's Maritime Aquarium.
These aren't any old lobsters; one is sky blue, one pumpkin orange, and the other is calico with yellow spots. Lobster shells are normally blackish-green while they are alive, but genetic abnormalities can cause them to turn different colors.
Just how rare is it? The Lobster Conservancy in Maine says the chance of seeing a blue lobster is 1 in a million. For the orange and calico lobster, it's 1 in 30 million.