http://www.greenpeace.org/international/en/news/Blogs/makingwaves/why-there-are-no-penguins-in-the-arctic/blog/12900/
关于企鹅为什么只在南极而不在北极,说法很多,这只是其中一部分:
http://superbeefy.com/why-do-penguins-live-in-antarctica-at-the-south-pole-and-not-in-the-arctic-at-the-north-pole/