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) through climate change, and the first Predator was a traitor who came to Earth with a cybernetic suit that would allow humanity to more easily stand up to the Predators. In the "Aliens vs. Predator" novel series (based on the Dark Horse Comics) by David Bischoff, Steve and Stephani Perry, the Predators, known in the series as "yautja," are depicted as living in a matriarchal clan-based society bearing similarities to a pack mentality whose strongest and most skilled of the group lead. The Predators are portrayed as sexually dimorphic mammals. The females are larger and stronger than males, and sport