Piranha is a 1978 American horror B movie about a swarm of killer piranhas. Aja directed "Piranha 3D", a horror movie about prehistoric piranhas in Arizona. All the boys collected exotic pets, such as tarantulas, piranhas, and boa constrictors. The use of live prey to feed carnivorous fish such as piranhas also draws criticism. This term is most often used when referring to sharks or piranhas. Pacu are commonly sold as "vegetarian piranhas" to home aquarium owners. Red-bellied piranhas are omnivores and primarily foragers. Red-bellied piranhas are sometimes kept as aquarium fish. The typical diet of red-bellied piranhas includes insects, worms, crustaceans, and fish. Most in the family other than piranhas are primarily herbivorous. Some Brazilian rivers have warning signs about lethal piranhas. While sitting on a jetty, they are both attacked by a swarm of piranhas. All piranhas have a single row of sharp teeth in both jaws. Aquarium piranhas have been unsuccessfully introduced into parts of the United States. The Sun Prairie Piranhas, the city's youth swim team, practice at the Family Aquatic Center.