35 Amazing Animals that Live in the Coldest Waters Around the World

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35 Amazing Animals that Live in the Coldest Waters Around the World

By Trista - July 15, 2019

3. Greenland sharks have been observed at depths of up to 7,200 feet.

Found in the sub-Arctic, Greenland sharks can survive the near-freezing temperatures of these waters thanks to a compound called trimethylamine oxide. This compound acts as a natural antifreeze and prevents ice crystals from forming in the sharks’ bloodstream. This compound also makes Greenland shark meat poisonous to humans and other mammals, so this species has no natural predators. Greenland sharks are among the most massive sharks globally and have been known to grow as long as 21 feet long. Greenland sharks are not spotted frequently because of their ability to dive to such extreme depths. Not only can they dive as deep as 7,200 feet, but they also sometimes can be found relaxing on the slopes and shelves far under the ocean’s surface. Although all sharks are cold-blooded, this particular species truly thrives in a frigid environment. They always migrate to the coldest part of the water each season. In fact, Greenland sharks are the only known shark species that can tolerate Arctic conditions all year long.

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2. Antarctic sea spiders’ legs can grow to span the width of your face.

Like all marine invertebrates, Antarctic sea spiders have a body composition that matches the ocean’s salinity, which means that as long as the water around them remains in liquid form, they cannot freeze. Antarctic sea spiders are considerably larger than temperate sea spiders, having an average leg span of 29.5 inches! It is thought that this polar gigantism occurs due to the heightened levels of oxygen found in cold water. Sea spiders are bizarre. They feed by sticking their proboscis into soft animals and sucking out the juices. These sea creatures do not have much room in their bodies, so their guts and reproductive organs reside in their spindly legs. They also do not have gills or lungs. To cope, they absorb oxygen through their cuticle or shell-like skin.

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1. Tardigrades — swimming water bears — are almost indestructible.

Also known as water bears, tardigrades are microscopic animals found in some of the world’s most extreme environments, including the deepest ocean trenches and under thick sheets of ice. They have eight legs and hands with four to eight claws on each. These animals can withstand exposure to absolute zero temperatures. Tardigrades survive by replacing most of their internal water with sugar trehalose, which prevents them from crystalizing and damaging cell membranes. They are also able to reversibly suspend their metabolism, a phenomenon known as natural cryopreservation. They can even survive the chilling conditions by going into an almost death-like state called cryptobiosis. These sea creatures curl into a dehydrated ball, known as a tun, by retracting their head and legs. The tardigrade can come back to life in just a few hours. Tardigrades can also make many antioxidants, which is another way to protect their vital organs from freezing waters.

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