Every winter, wood frogs freeze solid. They have no heartbeat -- their heart freezes too. For weeks at a time.

When he holds one in this video, narrator Robert Krulwich says "it feels like a rock."

But watch what happens next.



Friday will be well above freezing during the day and on Saturday it's predicted to get up to 60 degrees. You might want to check out your nearest vernal pond and see what's going on.

See also : LOOK FOR: Frog and Toad Eggs (and Tadpoles)

Happy Spring!