Wild world: Millions of unseen species fill Earth (AP)

This image, taken in 2002, about one mile deep near a huge underwater volcano near Monterey Bay, provided by NOAA shows this strange marine animal, thought to be a new species that has yet to be described or named. It is a type of mollusk, called nudibranch, that sheds its shell early in life. Scientists think there are millions of species, like this one, that have yet to be named or even discovered. (AP Photo/NOAA)AP - Our world is a much wilder place than it looks. A new study estimates that Earth has almost 8.8 million species, but we've only discovered about a quarter of them. And some of the yet-to-be-seen ones could be in our own backyards, scientists say.