Keystone species mussel population explodes uncontrollably, driving out most other species. These creatures need not be apex predators. Sea stars are prey for sharks, rays, and sea anemones. Sea otters are prey for orca. The jaguar, whose numbers in Central and South America have been classified as near threatened, acts as a keystone predator by its widely varied diet, helping to balance the mammalian jungle ecosystem with its consumption of 87 different species of prey. The lion is another keystone species. Keystone mutualists are organisms that participate in mutually beneficial interaction and the loss of which would have a profound impact upon
Predator (fictional species) impractical design by McTiernan that included 12-inch leg extensions that gave the Predator a backward bent satyr-leg. The design did not work in the jungle locations. After six weeks of shooting in the jungles of Palenque, Mexico, the production had to shut down so that Winston could make a new Predator. This took eight months and then filming resumed for five weeks, ending in February 1987. Jean-Claude Van Damme was originally cast as the Predator; the idea was that the star's abilities in martial arts would make the Predator an agile, ninja-esque hunter. When compared to Schwarzenegger, Carl Weathers, and