Like HowStuffWorks on Facebook!

Animals | Animal Facts

Learn about some of the strange and unusual facts and terms in the animal kingdom.

Featured
How Mad Cow Disease Works

Mad cow disease is in the news again, with tests confirming the second case in the United States since December 2003. Learn how this brain disease affects livestock and people.


What is the biggest animal ever to exist on Earth?

 What is the biggest animal ever to exist on Earth?

What is the biggest animal ever to exist? The current largest animal is the blue whale, but was it the largest animal to have ever existed? See more »

How Animal Camouflage Works

 How Animal Camouflage Works

Natural camouflage is an amazing thing - it increases an animal's chances of survival by tricking predators. Learn all about animal camouflage. See more »

How do fish rise and sink in the water?

 How do fish rise and sink in the water?

How do fish rise and sink in the water? With a little help from gravity and buoyancy. Find out your answer to this question at HowStuffWorks.com See more »

How Mad Cow Disease Works

 How Mad Cow Disease Works

Mad cow disease is in the news again, with tests confirming the second case in the United States since December 2003. Learn how this brain disease affects livestock and people. See more »