Though not a unique species, the mysterious world of colorful lobsters found its way into the spotlight this year when a high school freshman caught a beautiful (and extremely rare) blue lobster off the coast of Portland, Maine. The genetic defect that gave this lobster, affectionately named "Skylar," his brilliant blue hue effects an estimated 1-in-2 million lobsters.
Even rarer defects exist, making lobsters calico or solid yellow (1-in-30 million), half-brown and half-orange (1-in-50 million), or completely transparent (1-in-100 million) - making the lobster appear to be made of crystal.
6. Giant clam