The United Kingdom is counting its butterflies today — and will keep going for the next three weeks.
The ninth annual Big Butterfly Campaign kicks off today, with a big boost from a legendary voice.
"I did it in my garden," Sir David Attenborough intoned. "Where are you going to do yours?"
The ask is simple: Anybody in the U.K. can download an app or print out a chart that shows pictures of common butterflies.