I problemi legati allo svuotamento dei bacini artificiali, il cigno reale, la nascita di uno squalo. Questi i temi della puntata condotta da Gemma Fumasoli e Pierangelo Tomassetti, completata come di consueto dal quiz e dalla corrispondenza. "Natura amica", 09.02.1986. Realizzazione televisiva di Tony Flaadt.
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