The Lewis and Clark Expedition, officially the Corps of Discovery, traveled through what is now South Dakota from August 21 to October 14, 1804, and from August 21 to September 4, 1806. During their time there, they made numerous discoveries of animals, plants, birds, and fish previously unknown to science. Among these were the pronghorn antelope, which they called goats, and the prairie dog, which they called barking squirrels. Other new discoveries in South Dakota included the mule deer, coyote, great gray wolf, prairie rattlesnake, northern jack rabbit, and a different kind of porcupine. They also found the black billed magpie, which until then had been thought to exist only in Europe. They met with a number of Indian tribes, handing out gifts and making speeches about the great white father in Washington. Although there were a few tense moments, there were no battles with any tribes they encountered in present-day South Dakota.