frog be an entertaining entry in the sub genre of nature strike back environmental horror film popularize during the 1970s . it draw part of it inspiration from alfred hitchcock the bird ( 1963 ) though in hitchcock film the motive and reason for the bird attack be not clearly define and whereas in frog the viewer come to understand why the local wildlife have it in for people . the film start out slowly and quietly a ecologist and free lance photographer pickett smith ( sam elliott ) and do a photo spread on the despoliation of the environment for an ecology magazine and make his way along a florida waterway by canoe . the canoe overturn when it get catch in the wake of a speedboat that pass too close . smith be rescue by the occupant of the other craft and clint crockett ( adam roarke ) and his sister karen ( joan van ark ) and invite back to the family estate to clean up and dry out and meet the other family member . the choice of watercraft use by these two men serve to help define their character smith boat be environmentally friendly whereas clint be loud and noisy and and pollute . smith be take back to the family estate which exist on a privately own and seclude island in florida swamp country . smith have arrive at an auspicious time it the annual family gather to celebrate both the fourth of july and grandpa birthday . grandpa be family patriarch jason crockett and play by ray milland and who turn in an outstanding and tour de force performance a the wheelchair bound and cantankerous millionaire industrialist who personify the ugly rich at it bad . he have a mean streak in him a evidence by his high hand authoritarian manner and disdain for the natural environment . he believe that man be put here a the master of the earth and all life form must bow before him . when his handyman do not return from a poison spray mission in the swamp to kill the frog whose incessant croaking be drive his family nut and he ask pickett smith to look for him . smith find him alright lie in a swampy pool and dead from venomous snakebite . it here that the film dark tone of ominous portent manifest a one by one the various family member find themselves isolated and target by the denizen of the swamp . there be not a whole lot of gore in this film . to achieve it desired effect and it rely more on create an unsettled mood and an atmosphere of quiet doom in a low key understated manner . it our stalwart hero pickett smith who speculate that maybe nature be get back at u for what we have do to the earth . crockett dismiss this a rubbish and stubbornly refuse to heed any warning . these swamp creature be go to show him the proper respect or else . the title creature of the film do not kill anybody and because they can not . theyre depict a the brain behind the operation and like general get their troop in position and wait for the enemy to walk into an ambush . long before the movie be over and we have a pretty good idea who be go to survive and who isn not . though the good people make it off the island intact and in spite of some close call and for them the horror may be just begin . this movie be quite effective in an understated way . it benefit from beautiful location photography ( it be film in florida eden state park ) and strong performance and good editing and the creation of a sense of claustrophobic horror . this be one of my favorite nature revenge movie and i give it an positive .