Birds Have Been Your Neighborhood Watch Crew All Along

If you know how to listen, birds can tell you when there's a cat, a weasel, or even a person headed your way.
According to Mother Nature Network, birds' calls and body language reveal the presence of other wildlife.
For centuries, Native Americans have relied on so-called 'bird language.'
But really, anyone with sharp eyes and ears, and patience galore, can learn to translate songs into information.