Rated K in Greece for mild action & some nudity.
There's a brief scene where Ursula encounters a lion, and George then swings in and fights with the lion. Very young kids may find this to be a little tense, but it quickly turns into comedy as George tickles the lion and then throws him around the jungle as if they were both professional wrestlers.
Lyle swings a rope bridge back and forth and a porter falls from it toward the river several hundred feet below. The narrator, however, quickly chimes in, "Don't worry, no one dies in this story, they just get really big boo-boos" and the porter is later seen and appears to be okay, just with wounds and bandages.
There is also some crude humor.