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Wednesday, December 2, 2009

Flora and fauna


In the lower forested zone, birch, juniper, blue pines, firs, bamboo and rhododendron grow. Above this zone all vegetation are found to be dwarf or shrubs. As the altitude increases, plant life is restricted to lichens and mosses. Plants cease to grow at about 5,750 m (18,690 ft), because this is the permanent snow line in the Himalayas.
Forests of pine and hemlock cover the lower elevations of the national park. At elevations of around 3500 meters and above, forests of silver fir, birch, rhododendron and juniper trees are found. The forests provide habitat to at least 118 species of birds, including Danphe, Blood pheasant, Red-billed chough, and yellow-billed chough. Sagarmāthā National Park is also home to a number of rare species, including musk deer, wild yak, snow leopard, Himalayan black bear and red panda. Besides, many other animals such as Himalayan thars, deer, langur monkeys, hares, mountain foxes, martens, and Himalayan wolves are found in the park. However, their numbers are not very large and many visitors may not be able to see them.
The partial pressure of oxygen falls with altitude. Therefore, the animals that are found here are adapted to living on less oxygen as well as a cold temperature. They have thick coats to retain body heat. Some of them have shortened limbs to prevent loss of body heat. The Himalayan bears go into hibernation in caves during the winter when there is no food available.

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