Atomic tests in New Mexico cause ants to mutate into giant man-eating monsters.
The Birds (1963)
Winged creatures start attacking the residents of a small Northern California town in this Alfred Hitchcock thriller starring Tippi Hedren and Suzanne Pleshette.
Night of the Lepus (1972)
Giant mutant bunnies terrorize the Southwest in this Janet Leigh movie.
Before sharks took to the land and sky, one giant great white was enough to scare people from going in the water after seeing this classic Steven Spielberg thriller, starring Richard Dreyfuss and Roy Scheider.
Before Jeff Daniels tried to stop a mad bus bomber in Speed, got Dumb with Jim Carrey and earnestly delivered the news as Will McAvoy, he took on killer spiders in this classic thriller directed by Frank Marshall.
This gem concerns a National Geographic crew taken hostage by a madman (Jon Voight) on the hunt for Earth's biggest -- and most terrifying -- snake, which dwells in the Amazon. Jennifer Lopez and Ice Cube also star in this unintentionally hilarious film, which had the tagline: "When you can't breathe, YOU CAN'T SCREAM."
Eight Legged Freaks (2002)
David Arquette starred in this comedy horror film, from the producers of Independence Day, about poisonous spiders that grow into giant creatures. Co-stars included Scarlett Johansson and Doug E. Doug.
Snakes on a Plane (2006)
Samuel L. Jackson plays an FBI agent battling a plane full of -- you guessed it -- poisonous snakes. The movie co-starred Julianna Margulies and Kenan Thompson.
Mega Shark vs. Giant Octopus (2009)
Before Sharknado, California was threatened by a prehistoric giant shark and a massive octopus in this straight-to-video movie starring Deborah Gibson and Lorenzo Lamas.
Piranha 3D (2010)
Richard Dreyfuss faced off against frightening fish again in this movie about prehistoric man-eaters unleashed by a sudden underwater tremor. The all-star cast also included Elisabeth Shue, Ving Rhames, Christopher Lloyd, Jerry O'Connell, Kelly Brook, Adam Scott and Gossip Girl alum Jessica Szohr.
A half-shark, half-octopus creature created for the military terrorizes Mexico in this Syfy TV movie starring Eric Roberts.
Shark Night 3D (2011)
People vacationing at a lake house in Louisiana are subjected to shark attacks in this thriller.
Sand Sharks (2011)
The fish take to the land and terrorize a tropical paradise in this straight-to-video release starring Brooke Hogan.
Two-Headed Shark Attack (2012)
A mutated two-headed shark terrorizes Semester at Sea students in this straight-to-video movie starring Carmen Electra and Brooke Hogan.
The Syfy movie about a tornado full of sharks destroying Los Angeles ignited a Twitter frenzy. The TV event was directed by Anthony Ferrante and co-starred Tara Reid and 90210 alum Ian Ziering.