"Not garbage! Not an alien!" the Seaside Aquarium posted on Facebook recently. "It's a giant marine snail egg casing!" Fully grown, the Lewis' moon snail can grow up to 5.5 inches. The Washington ...

Fully grown, the Lewis' moon snail can grow up to 5.5 inches. The Washington State Department of Ecology calls it a "voracious predator," whose favorite dinner is clams.

Scientists dive into the genomes of whales, elephants, and other animal giants looking for new weapons in the fight against cancer.