They ventured countryward, and lent their fleas to a species of ground squirrels which were plentiful about the village of Carib.
He was daily more scornful toward the counters of paving stones, the renamers of species, the compilers of irrelevant data.
He blundered into the effect of phage on the mutation of bacterial species—very beautiful, very delicate—and after plodding months when he had been a sane citizen, an almost good husband, an excellent bridge-player, and a rotten workman, he knew again the happiness of high taut insanity.
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.