What are some of your favourite movies where animals played an integral role?

Not been asked before, there was one which stipulated “killer animals” but that’s a whole new ballgame. Yeah, what i’m after are movies you have seen & enjoyed whose principle characters were indeed animals. Some fine examples would include, Lassie, Homeward Bound, G-Force, & Seabiscuit…..starring Sarah Jessica Parker I believe. Okay, let’s hear your choices if you please.