The abundant black-tailed prairie dogs and their lives underground fascinated Lewis and Clark. Whistling from their sentry posts at the burrow mouths, the animals seemed to call to the explorers. Clark caught one by pouring water into its tunnel. Lewis dug ten feet down into a burrow but still didn't reach the bottom.
The explorers made the first scientific observations of the prairie dogs, which they called "barking squirrels." They noted the animals as they first entered South Dakota and commented on their behavior, from the warning cries that were like those of "little toy dogs" to their habit of living in small family groups within a larger colony.
Lewis was so charmed by the prairie dog that he shipped a live one to President Jefferson. The animal survived the four-month journey from North Dakota to Washington, D.C., by barge and ship, and Jefferson got to see firsthand the "barking squirrel" of the plains.
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