Every species passes down certain guiding wisdoms from one generation to another in hopes of preserving, prolonging, and bettering the lives of their offspring.  While Little Foot and his dinosaur friends Petrie, Cera, Spike, and Ducky are only young dinosaurs, their elders have taught them that they must always stay with the group, be home before dark, and keep their eyes and ears open.  When three strange yellow belly dinosaurs show up in the valley, it is quickly apparent that they are hopelessly ignorant of the wisdoms Little Foot and his friends hold true and it seems their quest to find Berry Valley and join the rest of their herd is destined to failure without the aid of Little Foot and his friends.  Striking off toward new lands, Little Foot and the gang save their new friends Doofah, Loofah, and Foobie from certain death at the hands of the sharp teeth several times, but eventually the young friends realize that although the yellow bellies may not heed the wisdoms they're familiar with, the yellow bellies have some instinctual habits of their own that safeguard them very well.  Lots of catchy music permeates this fun, animated, 76-minute adventure and the wholesome message about heeding the lessons of parents, grandparents, and other elders comes through clearly without seeming didactic.  Bonus features include the television episode "The Hidden Canyon" in which Little Foot's and his friends' failure to tell the other dinosaurs about a secret place full of tree sweets endangers the entire herd's existence, two interactive DVD games, and two sing-along songs. (Ages 5 to 11)--Tami Horiuchi