Six German boys visit the zoologist writer Bengt Berg in Sweden where they are shown film footage of water animals, migratory birds and elephants in the Nile area, narrated by the host's naturalistic adventure stories.
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Every day they clean the dirty windows of their cars from the filthy film that has formed overnight. Measuring stations call a low smog warning. But one day a soccer player collapses on the pitch with breathlessness.
