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 partridge seeds and some insect food. The Barbary partridge is the national bird of Gibraltar. Barbary partridge The Barbary partridge ("Alectoris barbara"), is a gamebird in the pheasant family Phasianidae of the order Galliformes, gallinaceous birds Native to North Africa. This partridge has its main native range in North Africa, and is also native to Gibraltar and the Canary Islands ("Alectoris barbara" ssp. "koenigi"). It has been introduced to Portugal and Madeira, though there are no recent records of this species on the latter islands. It is also present in Sardinia. The Barbary partridge is a rotund bird, with a grey-brown