Tag: hibernation

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Frozen Frogs that Thaw Out and Live

Frozen Frogs that Thaw Out and Live

Among the most incredible designs in the natural world is how God equipped various animals to survive winter. Some of the methods are relatively obvious. Burrowing deep under the frost line is one method. We have noted in the past the complex way bears give birth to young and retain urine while hibernating. Wood frogs are unique because they don’t burrow underground for protection from the cold. Instead, they become frozen frogs during the cold months.

Wood frogs are amphibians, meaning they are cold-blooded because they can’t generate any body heat. In winter, the water freezes in the frog’s cells but doesn’t expand and rupture them. They have a natural antifreeze preventing the cells from bursting when they freeze.

When spring arrives, the water inside the frog melts, and the frog awakens. Males immediately begin making a sound like a quacking duck, attracting females. Next, the male will grasp the female with his forelimbs wrapping around her torso. He squeezes until she releases her eggs into the water, where he fertilizes them. The males have a thumb that swells during the breeding season, enabling them to grasp the females.

Scientists are trying to understand how the wood frog’s cells can freeze without rupturing, causing death. Medical science wants to know how to freeze living tissue without damaging it for organ transplants. Many questions are still unanswered in the freezing and recovery of the wood frog. Why don’t all amphibians have this capability, and why is it limited to these creatures?

God has designed special equipment and chemicals to sustain life in all kinds of environments. So when we look at incredible designs, such as frozen frogs, we can know there is a God who created these unusual life forms. (Romans 1:20).

— John N. Clayton © 2022

Reference: National Geographic October 2022, page 28.

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Arctic Ground Squirrels Hibernate

Arctic Ground Squirrels Hibernate

Squirrels in Arctic areas seem to have a hibernation technique which could be described as suspended animation. Arctic ground squirrels (Urocitellus purryii) go into a state of deep torpor breathing once a minute with a heart rate of five beats per minute. Every two to three weeks, the squirrels revive for 12 to 24 hours, but they don’t eat, drink, or eliminate during that time.

Researchers from the University of Alaska, Fairbanks, have found that hibernating Arctic ground squirrels have skeletal muscle breakdown, releasing nitrogen to compensate for lack of food. Even though this is happening, the squirrel’s total muscle mass doesn’t change. It appears that they have protein stored up to handle their needs, but scientists are trying to understand where and how that protein is made available. This is another designed characteristic that allows life to exist in the Arctic.

Realize that there are unique problems in an ecosystem that is shut down for eight months. The design of larger animals allows them to migrate, and caribou herds go great distances to survive the Arctic winter. The migration of salmon into Arctic waters is another provision for animal survival. The salmon become food for Arctic animals, and their bodies become fertilizer so plants can grow in an area with virtually no soil.

Smaller animals have a big problem because they can’t migrate, and their plant-based food sources have a very short growing season. It appears that Arctic ground squirrels are a vital link in maintaining the balance of food and plant growth. The squirrels bury seeds so new plants can grow, and they provide a nutrient source for predators like wolves and wolverines. The complexity of how they do this has led to a whole new area of biology with its own magazine–Nature Metabolism.

Scientists are researching the Arctic ground squirrels’ metabolism to understand how this complex system works. Whatever the biochemistry involved, it is highly complex and strongly supports the belief that God designed life forms to survive even in a cold environment.

— John N. Clayton © 2021

Reference: Nature Metabolism December 7, 2020 and Science News for January 30, 2021, page 10.

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Shivering in the Cold

Shivering in the Cold
As I write this on January 21, my outdoor thermometer says that the temperature here in Michigan is -5 degrees Fahrenheit. I just graded a correspondence course from a young lady who lives in Tennessee. She asked, “How can the squirrels I see outside live when it is so cold here, and not even shiver?” It was 35 degrees Fahrenheit where she lives. Why don’t we see squirrels and other animals shivering in the cold?

Recently an atheist said that if God did exist, He wouldn’t make incredibly cold places like Alaska. In his mind, God is just too cruel to believe in. He would rather have the whole planet be like where he lives in central Florida.

There are so many problems with that view it would take much more space to discuss them all. The fact is that many animals are designed for the cold, right on down to making their bodies not feel it. The February/March 2019 issue of National Wildlife (page 8) has an interesting discussion about species of animals that have cold-sensing nerve cells that don’t feel temperatures below 68 degrees F. This allows an animal’s body temperature to drop for long periods so they can hibernate. They do not experience the cold that would keep them awake. Animals that don’t hibernate can survive and be active in temperatures as low as 35 degrees F without feeling the cold, and they can do so for up to nine months.

There are many benefits of animal hibernation both for them and for the ecosystems in which they live. God is sensitive to the problems produced by very cold conditions or even uncomfortable temperatures for humans. He has designed not only the conditions but also the physiological makeup of the living things that exist within those systems so they won’t be left shivering in the cold.
–John N. Clayton © 2019