Grunion shrimp. An isopod, two species of flies, sandworms, and a beetle have been found preying on the eggs. Some shorebirds such as egrets and herons prey on grunion when the fish are on shore during spawning. Seagulls, sea lions, and larger fish such as sand sharks have also been observed feeding on grunion during a grunion run. The reduction of spawning habitat due to beach erosion, harbor construction, and pollution is believed to be the most critical problem facing the grunion species. Despite local concentrations, the grunion is not an abundant species. While the population size is not known, all
Revenge of the Creature dismissive of the production. Although "Revenge of the Creature" has been broadcast on television in red-and-blue-glasses anaglyph form (e.g., in 1982 in the San Francisco Bay area), it was originally shown in theaters by the polarized light method and viewed through glasses with gray polarizing filters. A "flat" version without 3D was also released. In 1997, "Revenge of the Creature" was mocked on the comedy television series "Mystery Science Theater 3000", marking its first episode on the Sci-Fi Channel. Universal released "Revenge of the Creature" on DVD in a boxed set, along with "Creature from the Black Lagoon" and "The