最近有一则新闻报道说,由于气候的变化,导致北极熊之间发生了同类相食的惨剧。其实同类相食的现象在自然界中并不鲜见,在过去被认为是偶然或病理现象,但最新研究指出,这些令人不解甚至感到惊悚的“自相残杀”现象,另有隐情。好像一切都是为了生存。本期专题,让我们了解一下生命延续的一种极端形式。——编者 A recent news report said that the climate change has led to the tragedy of the same kind of eating between polar bears. In fact, the phenomenon of similar food is not uncommon in nature, in the past is considered an accidental or pathological phenomenon, but the latest research pointed out that these puzzling or even thrilling “cannibalization ” phenomenon, and another hidden . It seems that everything is for survival. This issue, let’s see an extreme form of life extension. --editor