The animal kingdom: You could spend your entire life studying it, and there would always be more to learn. Few areas of study are quite as diverse or fascinating. Shrews, for example, have metabolisms so high, they have to eat at least three times their body weight daily. Canis familiaris, the domestic dog, is the most diverse species on earth. If there was as much genetic variation in humans as in dogs, the tallest of us would be seven feet tall, and the shortest just two feet tall!
You're probably not a zoologist but did take biology, zoology, or similar courses in school. Do you ever wonder how much you remember? If so, we've designed a quiz for you. For example, do you with which animal we humans share 98 percent of our DNA? Or what animal sleeps hanging upside down? And is a "liger" a thing? (No. No, it's not. We're not even going to test you on that one).
So, whether you love domestic animals, like a dog or cat who shares your couch, or you're fascinated by animals that live in the wild, like the gorilla or jaguar, test your knowledge with our quiz. We promise that if you don't do well, you won't end up in the doghouse!
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!