Day of the Animals Movie (1977) Trailer - Plot synopsis: A battle for survival ensues after a group of hikers encounters a chemically imbalanced forest.br Day of the Animals tells the story of a psychosis brought on by depletion of the Earth's ozone layer, affecting all animals at high altitudes. A group of hapless hikers must survive the animal onslaught and make their way to safety, even as the psychosis turns them against each other.br Director: William Girdlerbr Writers: William W. Norton, Eleanor E. Norton, Edward L.