Day Of The Animals (1977)
The depletion of the earth's ozone layer causes animals above the altitude of 5000 feet to run amok, which is very unfortunate for a group of hikers who get dropped off up there by helicopter just before the quarantine is announced.
Directed by: William Girdler
Starring: Christopher George, Leslie Nielsen, Lynda Day George, Richard Jaeckel, Michael Ansara, Ruth Roman
Links: IMDb, Movie posters, Movie stills