Wood frog by Brian Gratwicke on Flickr.

Wood frogs (Rana sylvatica) are the only North American amphibian species whose range extends into the Arctic Circle. They can do this because they have the ability to survive being frozen solid.

Frozen Frogs:Learn how wood frogs freeze. See a wood frog thaw in spring.

Amazing nature -- wood frogs can literally freeze themselves, stopping their hearts, throughout the winter season, and then they thaw with the coming of spring.

How Arctic Frogs Survive Being Frozen Alive – News Watch Nat Geo

Wild Romance: Weird Animal Courtship and Mating Rituals

The Vernal Pool- information from the Vernal Pool Association

The Vernal Pool- information from the Vernal Pool Association

Spotted salamanders were just one of the many species biologists Kent McFarland and Sarah Zahendra found while observing a vernal pool in Strafford teeming with activity in the early spring.

Spotted salamanders were just one of the many species biologists Kent McFarland and Sarah Zahendra found while observing a vernal pool in Strafford teeming with activity in the early spring.

Wood Frogs (In Winter, Where Do They Go?) by Joyce Markovics

Presents information about wood frogs and how they survive winter temperatures in hibernation.

Wood Frog (Life Cycles) by David M. Schwartz

Wood Frog (Life Cycles) by David M.

A Wood Frog's Life (Nature Upclose) by John Himmelman

A Wood Frog's Life (Nature Upclose) by John Himmelman

Wood Frogs-NWF Including tadpole recognition of siblings

Wood Frog (Rana sylvatica) Wood frogs have adapted to super cold climates by freezing over the winter. They stop breathing and their hearts cease to beat. They produce a special antifreeze substance.

Wood Frogs -Lib (Really Wild Life of Frogs) by Doug Wechsler

Wood Frogs -Lib (Really Wild Life of Frogs) by Doug Wechsler

Wood Frog (Life Cycles) by David M. Schwartz

Wood Frog (Life Cycles) by David M.

NOVA | Frozen Frogs: Expert Q&A

Miami University researcher Jon Costanzo answers questions about reptile and amphibian cryobiology.

NOVA | Cold Cures Article on freezing

Frozen Frogs:Learn how wood frogs freeze. See a wood frog thaw in spring.

UMichigan "biokids"

Wood Frog :: Arkansas Frogs and Toads This is the little guy with the Lone Ranger mask! Sounds like a hoarse duck quack - quiet.

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