Madagascar ratings (Movie franchise)

Plot of the first movie: Longing to roam free in the vast landscapes of Mother Africa, Marty, the bored and dejected zebra of the famous Central Park Zoo, escapes his prison on the night of his tenth birthday celebration. However, after a botched rescue attempt by Marty's companions--Alex, the content lion; Melman, the skittish giraffe, and Gloria, the resolute hippo--the friends will find themselves crated up and shipped off to a remote wildlife preserve, only to end up on the sandy shores of exotic Madagascar. At last, Marty's dream will come true; nevertheless, what does it really mean to be a truly wild animal?