Avatar, the new James Cameron movie, takes place on a world where humans are the aliens... and the natives are suspicious.  If you like this movie, check out some of our books where humans are the aliens. 

One of my favorites is The Right To Arm Bears by Gordon Dickson. 

Planet Dilbia is in a crucial location for both humans and their adversaries, the Hemnoids. Therefore making friends with the Dilbians and establishing a human presence there is of the utmost importance, which may be a problem, since the bearlike Dilbians stand some nine feet tall, and have a high regard for physical prowess. They're not impressed by human technology, either. A real man, er, bear doesn't need machines to do his work for him.

But Dilbians "are" impressed by sharp thinking, and some have expressed a grudging admiration for the logical (and usually sneaky) mental maneuvers that the human "shorties" have used to get themselves out of desperate jams. Just maybe that old human craftiness will win over the Dilbians to the human side. If not, we lose a nexus, and the Dilbians will learn just how unbearable Hemnoids can be....

If you have a favorite Human off of Earth book, Contact Youth Services to share it!