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In every episode, Arthemus asks his grandchildren a question on the subject of animals. Why do crocodiles swallow stones? Why do elephants cover their bodies in mud? To find the right answer, nothing beats setting off around the world! Thanks to “Magic Planet”, an infernal machine he invented, Arthemus sends Lea, Lucas and Zark to the four corners of the planet! In every country, they are welcomed by an inhabitant that, through encounters and discoveries, will help them to answer their question.