Question: when do wood thrushes fly when they are migrating
[{'answer': 'at night', 'provenance': [{'wikipedia_id': '379910', 'title': 'Wood thrush', 'start_paragraph_id': 14, 'start_character': 523, 'end_paragraph_id': 14, 'end_character': 531, 'bleu_score': 1.0, 'section': 'Section::::Distribution and habitat.\n'}]}, {'answer': 'in the winter', 'provenance': [{'wikipedia_id': '379910', 'title': 'Wood thrush', 'start_paragraph_id': 14, 'start_character': 267, 'end_paragraph_id': 14, 'end_character': 280, 'bleu_score': 1.0, 'section': 'Section::::Distribution and habitat.\n'}]}, {'answer': "at night , allowing them to find their direction from the stars and orient themselves by detecting the Earth 's magnetic field"}, {'provenance': [{'wikipedia_id': '379910', 'title': 'Wood thrush', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 647, 'bleu_score': 0.9331600394719781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14293760327653916563}, 'section': 'Section::::Distribution and habitat.\n'}]}, {'provenance': [{'wikipedia_id': '379910', 'title': 'Wood thrush', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14293760327653916563}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '379910', 'title': 'Wood thrush', 'section': 'Section::::Distribution and habitat.\n', 'start_paragraph_id': 14, 'end_paragraph_id': 14, 'meta': {'evidence_span': ["The wood thrush's breeding range extends from Manitoba, Ontario and Nova Scotia in southern Canada to northern Florida and from the Atlantic coast to the Missouri River and the eastern Great Plains. It migrates to southern Mexico through to Panama in Central America in the winter, mostly in the lowlands along the Atlantic and Pacific coasts.", "The wood thrush's breeding range extends from Manitoba, Ontario and Nova Scotia in southern Canada to northern Florida and from the Atlantic coast to the Missouri River and the eastern Great Plains. It migrates to southern Mexico through to Panama in Central America in the winter, mostly in the lowlands along the Atlantic and Pacific coasts. It generally arrives on the U.S. Gulf Coast during the first week of April. Fall migration usually begins in mid-August and continues through mid-September. Migration takes place at night, allowing them to find their direction from the stars and orient themselves by detecting the Earth's magnetic field.", "Migration takes place at night, allowing them to find their direction from the stars and orient themselves by detecting the Earth's magnetic field."]}}]}]