Quiz: What animal does each eye belong to? Imagine a startled pigeon flying at your head. Your eyes—and brain—allow you to see this obstacle quickly, without thinking, and to duck (if you're lucky).

When you buy through links on our articles, Future and its syndication partners may earn a commission. How much do you know about the animals currently living on our planet? Take our quiz to find out.

Take our quiz to find out. National parks provide habitat for 600 or so threatened and endangered species, and wildlife viewing is one of the top reasons people visit parks. What rare, charismatic ...

We don't know exactly when the first animals on Earth appeared, but it's thought to be around 700 million years ago. Around ...