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  2. From Ice Age to Modern Day: How Reindeer Thrive in Extreme Cold

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    A reindeer’s nose is full of blood vessels that warm cold air as it is inhaled, which is why reindeer noses often exhibit a distinct red hue in cold weather. In a fraction of a second, the cold ...

  3. Discover the Epic Journey of Reindeer: From Tundras to Forests

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    Reindeer’s cloven hooves are well adapted to survive the cold. During colder months, a reindeer’s hooves toughen up, allowing them to step on frozen, harsh terrain. Their eyes are adapted to ...

  4. Discover the Incredible Adaptations That Help Reindeer Thrive ...

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    Reindeer are a species of deer also known as caribou in certain regions. They are found in the Arctic tundra and boreal forests. Finland is home to a small population of woodland reindeer.

  5. Mountain reindeer - Wikipedia

    en.wikipedia.org/wiki/Mountain_reindeer

    The mountain reindeer has several physiological adaptations to cope with different environmental temperatures. Reindeer have hemoglobin that allows for high oxygen unloading even at very cold temperatures. [1] This is essential because reindeer limbs are often kept much colder than core body temperature, a phenomenon known as regional ...

  6. Ectotherm - Wikipedia

    en.wikipedia.org/wiki/Ectotherm

    An ectotherm (from the Greek ἐκτός (ektós) "outside" and θερμός (thermós) "heat"), more commonly referred to as a "cold-blooded animal", [1] is an animal in which internal physiological sources of heat, such as blood, are of relatively small or of quite negligible importance in controlling body temperature. [2]

  7. Barren-ground caribou - Wikipedia

    en.wikipedia.org/wiki/Barren-ground_caribou

    Several named Rangifer fossils in Eurasia and North America predate the evolution of modern tundra reindeer. Archaeologists distinguish “modern” tundra reindeer and barren-ground caribou from primitive forms — living and extinct — that did not have adaptations to extreme cold and to long-distance migration. [30]

  8. 12 Incredible Reindeer Facts for Christmas - AOL

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    In freezing weather, these blood vessels supply and regulate the body’s temperature while also tinting the reindeer’s nose pinkish-red! 9. Reindeer “Click-Clack” as They Walk

  9. Homeothermy - Wikipedia

    en.wikipedia.org/wiki/Homeothermy

    Homeothermy is one of the 3 types of thermoregulation in warm-blooded animal species. Homeothermy's opposite is poikilothermy. A poikilotherm is an organism that does not maintain a fixed internal temperature but rather its internal temperature fluctuates based on its environment and physical behaviour. [3] Homeotherms are not necessarily ...