The scarlet ibis (Eudocimus ruber) is a species of ibis in the bird family Threskiornithidae. ... Traditional Linnaean taxonomy classifies it as a unique species, but some scientists have moved to reclassify it as a ... More recent observation, however, has documented significant crossbreeding and hybridization in the wild.
Depends on what mountain you are on
If you are on Everest, then the amount of effective oxygen available would be 6.9% (0 altitude would be 20.9)
that is why anyone should always bring oxygen tanks when climbing a high mountain
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