This third in the Ice Age series is my favorite, I believe.

Rating: Null/10 (21 November 2009)

Just to reflect for a few seconds, I grew up in the 1950s when animated "cartoons" were part of the attraction at the theater. When you consider that process, and what we have now in the animation like "Ice Age", it is amazing how far animation has come in my lifetime.
This "Ice Age" story is in a fictional time when the ice age was still upon the Earth, but an vast, lush underground world is discovered, where dinosaurs and other creatures, thought to be extinct, were still thriving. It starts when the sloth breaks through some thin ice and discovers 3 very large eggs. So he brings them to safety, where they hatch while he is napping. They are baby T-Rex dinosaurs, and of course imprint on his as their "mother." Trouble comes when the real mother is looking for her babies, and ends up carrying them plus the sloth down into the strange land.
This all happens as the story begins, and most of the movie has the rest of the mixed ice age "family" traveling down into this strange world to try to rescue their friend, the sloth.
The animation, of course, is flawless. The story is a lot of fun and very inventive. I laughed often. As with the other two, the silly squirrel, Scrat, provided much of the entertainment. Here he meets an alluring female squirrel, and when they are competing for a plump acorn, then falling into a deep chasm, he finds out she is, in fact, a flying squirrel.
Good movie. I may buy a copy of the DVD.