Only a small fraction of the 400-plus known species of extinct dinosaurs have appeared on TV and movie screens. Meet some of the more unusual members of T. rex and Velociraptor's family tree.

Can you match up these eight dinosaur fossil photos with their descriptions? It's harder than you think!

How much do you know about the Age of Dinosaurs? Brush the dust and other sediment off your brain, and test your paleontology knowledge with this interactive quiz.

How much do you really know about horses? Test your equine knowledge with this interactive quiz. Don't worry, there's no grading—just a helpful look at the answers when you're done!

Today, species are becoming extinct—disappearing from our planet—at a faster rate than ever before. What's behind this increase, and what can be done to slow or stop it? 

Travel around the world with museum scientists. First stop Madagascar, where you'll meet a species of whales with fingerprint-like tails and primates that use their teeth to groom each other.

After singing a song about a cloned sheep to the tune of "Mary Had a Little Lamb," kids investigate the how and why of cloning. This Web page helps kids understand cloning and explains some of the ethical issues involved.

The next time you eat a tomato, ask yourself: What would it taste like if there were a bit of flounder in it? Learn how scientists are using genetics to change the food you eat.

Would you clone your dog if you could? Do you have the right to know that you're eating cloned chicken? Step into the future for a look at the questions you may one day have to answer.

If you're interested in genetics, then meet your match in these OLogists. Find out where Emily, Logan, Seth, and Rob have followed their born curiosity.