Alexander Theodor von Middendorff (Russian: Алекса́ндр Фёдорович Ми́ддендорф, romanized: Aleksandr Fyodorovich Middendorf; 18 August 1815 – 24 January 1894) was a Russian zoologist and explorer of Baltic German and Estonian extraction. He was known for his expedition in 1843–45 to the extreme north and east of Siberia, describing the effects of permafrost on the spread of animals and plants.
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