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) Predator flesh and blood, if consumed, is shown to have the capacity of greatly lengthening a human's lifespan. In the first-person shooting video game "", Predator appears as a hidden killstreak on the multiplayer map "Ruins" from the Devastation map pack. The player can play as Predator for a brief period by completing a Field Order and obtaining a care package. Predator is also a playable guest character via downloadable content in the fighting game "Mortal Kombat X", opposite an Alien. In the tactical shooting video game "", a live event titled "The Hunt" was released on December 14, 2017.