You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: NATURE 
Clue: The propagation of oak trees depends on the lousy memories of these animals

Answer: squirrels


Question: Category: THE STOCK MARKET 
Clue: In 2006 this Milwaukee-based co. announced its new stock symbol, "HOG", at a gathering in Sturgis, S.D.

Answer: harley-davidson


Question: Category: SCIENTISTS 
Clue: In the 1740s he published "Flora Suecica" & "Fauna Suecica", 2 volumes of his observations

Answer:
carolus linnaeus