Chris Mills from Traverse City, MI on January 18, 2018: Linda, You thoroughly researched This topic and wrote it expertly. Hi, Penny. The temperature of its surroundings determines how long a wood frog stays frozen. These act as a seed for ice growth in the water that has collected in the extracellular spaces. Dora Weithers from The Caribbean on March 21, 2017: The wood frog is a marvelous creature. In most other animals, when the heart stops beating the animal is dead. Once the first ice crystals reach a wood frog, however, its skin freezes. The frogs can safely undergo multiple freeze-thaw cycles in a winter. It is surprising that glucose can be so helpful! The frog's liver produces a large amount of glucose as winter approaches. This wood frog can stay frozen all winter until it thaws out in spring. Tags: Question 5 . You never know when information like this will come in very handy for a work of fiction. It's a small animal that is around 1.4 to 3.25 inches in length. A chain of events occurs to protect the freezing frog. As a result, a hibernating frog looks as though it's frozen and feels like a solid block. Frogs frozen solid, but in the spring they come back to life. Genna East from Massachusetts, USA on March 22, 2017: I've heard of these frogs before from my father; he was a research biologist and fascinated with their methods of survival, and the production of a kind of antifreeze. Hi Linda, I found this article quite intriguing. Coffee Shop. Understanding how the frog's body responds to temperatures below and then above freezing may help us improve the cryopreservation (preservation at low temperatures) of human cells, tissues, and organs. Humans may experience a reperfusion injury, or tissue damage, when blood returns to an area after being absent for a while. Great work opening our eyes to this scientific secret. The frog becomes hard and crunchy. The frog becomes hard and crunchy. After a half-year in the living-dead stage, wood frogs thaw in springtime and hop away to a nearby breeding pond as if nothing happened. Unlike the other frog species, Rana Sylvatica can survive in extreme cold climate. Not Now. It first requires a bird like a sandhill crane to eat an infected frog, which maybe is not moving well with those extra legs. This amazing characteristic makes them inhabit chilly areas as well. Preventing Cells From Freezing in the Winter The frog's liver produces a large amount of … Eric M Bordner from Florence on May 06, 2017: This is a very thorough article and it is really well written. During his research, Larson collected 18 wood frogs in Fairbanks and fitted them with tiny glue-on transmitters. Linda Crampton is a writer and teacher with an honors degree in biology. The animal's range covers the majority of Canada and extends into Alaska and down into the northeastern United States. The frogs live mainly in woods, as their name suggests, but they also inhabit grasslands and the tundra. The Meatza Wagon. The frog appears to be in good condition once it's thawed. It would be great if understanding the frog's physiology helped humans. The reason for the appearance of these reactive chemicals is still being investigated. In contrast, a high glucose level in the blood or in cells doesn't seem to be dangerous for wood frogs, at least heading up to and during hibernation. The glucose molecules are used as an energy source. “This parasite wants this frog to be eaten.”, [Raccoons, wild pigs and other bad ideas for Alaska]. Intriguing article; and so well written, Linda. It should be very interesting to see what else is discovered about them. The wood frog is an intriguing animal that may have much to teach us. The situation is still being explored. Though Larson did not find a deformed frog in Fairbanks, he found that the parasites can survive in overwintering wood frogs. 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