Crows go to "tool-school"(news.bbc.co.uk)3 points·by transmit101·16 ปีที่แล้ว·0 commentsnews.bbc.co.ukCrows go to "tool-school"http://news.bbc.co.uk/earth/hi/earth_news/newsid_9125000/9125227.stm0 commentsPost comment—