Misc: Who wrote the book 'Animal Farm'?

Questions

What primate, from the mountains of Japan, keeps warm in winter by bathing in hot volcanic springs??

How do salmon find their way back to their home river to spawn every year??

The glass snake is actually a ________??

Which has the largest population (2003): Iraq, Kuwait, Egypt, Jordan??

What country does not border Iran: Turkey, Pakistan, Iraq, Oman??