Please answer the following question: What type of details about richard maack can be gathered from the following bio? Bio: richard otto maack -lrb- also richard karlovic maak , russian : ; 4 september 1825 -- 25 november 1886 -rrb- was a 19th-century russian naturalist , geographer , and anthropologist . he is most known for his exploration of the russian far east and siberia , particularly the ussuri and amur river valleys . he wrote some of the first scientific descriptions of the natural history of remote siberia and collected many biological specimens , many of which were original type specimens of previously unknown species . ethnically maack was an estonian ; however , the russian empire controlled this country during his lifetime . he was a member of the siberian branch of the russian geographical society .
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