Discovery Channel is very good Channel and It give entertainment and knowledge.Discovery Channel explain wildlife and Nature.There are many seriels related to Wildlife and Nature.
There are many famous serials for example : -
( 1) Man Vs Wild
( 2) Man and Women Vs Wild
My favourite serial is Man Vs Wild. This serial host by Bear Grills.Bear Grills has very much knowledge about Wildlife and Nature.
Bear Grills go to many places and show as how to life in the most dangerous places.