Bigfoot 'scream'?

I know "The Mysterious Monsters" contains a scene in which three campers record unusual sounds made by an unknown creature, presumably Bigfoot. I'm trying to remember the name of another such 1970s "documentary" film that features a similar story about a family who claimed they heard unusual sounds near their remote home. The narration of that film is along the lines of "ordinarily this family heard moose after sunset in a nearby river. On this particular evening, there were no moose. Sound engineers have reproduced what this family heard instead that night." At that point, a similar "Bigfoot" recording is played that culminates in a blood-curdling scream. Does anyone remember this?