Columbia subject headings:
Animals (Philosophy)
Harvard subject headings:
Animals (Philosophy)
Leopardi, Giacomo, 1798-1837--Knowledge--Animals.
Leopardi, Giacomo, 1798-1837--Philosophy.
Princeton subject headings:
Animals (Philosophy)
Leopardi, Giacomo, 1798-1837--Knowledge--Animals.
Leopardi, Giacomo, 1798-1837--Philosophy.