Nikolai Alekseevich Severtzov
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Nikolai Alekseevich Severtzov (1827 - February 8, 1885) was a Russian explorer and naturalist.
Severtzov wrote the Vertical and horizontal distribution of Turkestan wildlife (1873), which included the first description of a number of animals. Among them an argali (wild sheep) species later named after him: Ovis Ammon Severtzovi.
The Institute of Ecology and Evolution of the Russian Academy of Sciences in Moscow is named after A.N. Severtzov.