"Alas!" said the other, "it was love; love, the comfort of the human species, the preserver of the universe, the soul of all sensible beings, love, tender love."
He resolved one fine day in spring to go for a walk, marching straight before him, believing that it was a privilege of the human as well as of the animal species to make use of their legs as they pleased.
There are no more uses of "species" in the book.
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It is an endangered species.
It is thought that there are over 20,000 species of ants.