David Antenborough narrates this picture-book send-up of a nature documentary, sounding just like the real-life David but with more gesticulations, since he has six limbs at his disposal. Director Stephen Spielbug tries to keep the cast of characters on task, but it's worse than herding cats: The orb-weaving spider would like to eat one or two other actors; the grasshopper is a diva; the worm is too busy munching dirt to emerge from the ground on...