Task: Translation
Input (Chinese): 在对牛和鹿的放牧和睡眠模式进行了研究之后，德国科学家在本周的《国家科学院学报》上发表了一份报告，报告得出的结论说，大型兽群可能具有探测地球磁场的能力。
Output (English): Large herd animals may have the ability to detect earth's magnetic field, concluded scientists in Germany in a report published in this week's Proceedings of the National Academy of Sciences after performing studies of cattle and deer grazing and sleeping patterns.