Wildlife
Altitude tolerant organisms are adapted to living high up where oxygen levels - or carbon dioxide levels in the case of plants - are low. The upper reaches of mountain ranges are also often bitterly cold, or subject to swinging daily extremes in temperatures.
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High-altitude animals
The lammergeier, red-billed chough and tahr live in the highest Himalayas.
The lammergeier, red-billed chough and tahr live in the highest Himalayas.
Superhigh life
David Attenborough discovers tiny spiders and aphids four miles above the Earth.
David Attenborough discovers tiny spiders and aphids four miles above the Earth.
Hunt exhaustion
A fox has to work out a low-energy hunting strategy on the Andean altiplano.
A fox has to work out a low-energy hunting strategy on the Andean altiplano.
Himalayan crossing
Bar-headed geese have to negotiate the low-oxygen roof of the world.
Bar-headed geese have to negotiate the low-oxygen roof of the world.
Highest flyers
Bar-headed geese deal with hypoxia and pain to scale the Himalayas.
Bar-headed geese deal with hypoxia and pain to scale the Himalayas.
Red panda
Snow leopard
Spectacled bear
Tibetan fox
Argali sheep
Bharal
Bighorn sheep
Dall sheep
Guanaco
Plateau pika
Gelada baboon
Golden snub-nosed monkey
Yunnan snub-nosed monkey
Himalayan marmotAltitude or height is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, and more). As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context. Although the term altitude is commonly used to mean the height above sea level of a location, in geography the term elevation is often preferred for this usage.
Vertical distance measurements in the "down" direction are commonly referred to as depth.
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Other Adapted to extremes behaviours
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Great Basin bristlecone pine 
Snowdon lily 
Whitebark pine 
Bar-headed goose
Andean condor
Lammergeier
Kea
Andean hillstar
Common swift
Tibetan spring snake
Himalayan jumping spider