Amazing adventures of sam the bat

Young Sam, safe with his mother in the free-tail bat colony in the Southern California desert, learns all the stories of his tribe. The most famous is the tale of the lost colony, who flew east to escape a drought and never returned. The story says the lost ones found a new home, under a bridge over a river, but no one knows for certain. One fateful day, Sam loses his own colony and home, and thus begins an incredible adventure.