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
Barbary stag in the 1990s. One population can be found in Tazekka National Park in the Middle Atlas Mountains. Recent genetic studies indicate that the North African red deer population is practically indistinguishable from the Sardinian and Corsican populations, generally referred to as the Corsican red deer. This strongly argues for an ancient introduction of red deer from North Africa to these Mediterranean islands by humans. Further analysis suggests that the Barbary stag, including the Corsican red deer, belongs to a separate species, and should be grouped under the name "Cervus corsicanus". The Barbary stag has or has had predators like the