Question: What animal did Lewis and Clark newly discover during their 1804 expedition up Old Baldy in Nebraska?
{'answer': 'black-tailed prairie dog', 'supporting_facts': [['Old Baldy (Lynch, Nebraska)', 0], ['Old Baldy (Lynch, Nebraska)', 1], ['Black-tailed prairie dog', 0], ['Black-tailed prairie dog', 2], ['Black-tailed prairie dog', 3], ['Black-tailed prairie dog', 5]]}