The message here is about how orphans need love and how an unlikely animal steps up to save an orphan from certain death. The unique relationship teaches us about how, even in the animal kingdom, a child doesn't have to be left behind just because its biological mother is gone. That said, unlike other nature documentaries, there's no call to action or conservation in Chimpanzee (although some proceeds will support the Jane Goodall Institute); it's more of a glimpse at the life of chimpanzees and how they must protect their own territories and natural resources in order to survive.
Some children will be upset by the scenes of suspense and peril during the various confrontations between the two chimpanzee groups. Scar and his much larger and stronger family attack Freddie, but the violence is edited quickly, so you can't really tell what's going on or which chimpanzees are injured. But the narration explains that Oscar's mother is hurt and can't get off the forest floor. Then, during a frighteningly loud thunderstorm, a leopard is shown, yells are heard, and the narration says that Oscar's mother "will never return." Her death is then referenced several times. The chimps also plan and execute a successful monkey hunt, but audiences don't see the dead animal.
The narrator says "What an idiot" in one line. "Oh my God" is said.