A fossil unearthed two decades ago in northeastern China has captured renewed scientific attention this summer after researchers confirmed it as the oldest known case of polycephaly—a congenital ...

ST. LOUIS Officials of the World Aquarium at the City Museum subscribe wholeheartedly to the maxim that two heads are better than one. If they're on the same animal, that is. Aquarium officials hope ...

Mutations in the animal kingdom can produce creatures with anatomy that appears almost impossible. Some animals develop extra heads or limbs, while others are born with missing or dramatically altered ...

BRANSON, Mo. — Is it one snake or two? With two heads, it must have two brains, even though it shares one body. Either way, Tiger and Lily are having a birthday party next week, and the public’s ...