Question: who are the crakers in oryx and crake
[{'answer': 'primitive human - like creatures', 'provenance': [{'wikipedia_id': '537049', 'title': 'Oryx and Crake', 'start_paragraph_id': 5, 'start_character': 91, 'end_paragraph_id': 5, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Plot summary.\n'}]}, {'provenance': [{'wikipedia_id': '537049', 'title': 'Oryx and Crake', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 630, 'bleu_score': 0.8835415063984561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12289723954917904192}, 'section': 'Section::::Plot summary.\n'}]}]