Mandrill
The mandrill is an omnivore. It usually consumes plants, of which it eats over a hundred species. It prefers to eat fruits, but will also eat leaves, lianas, bark, stems, and fibers. It also consumes mushrooms and soil. Carnivorously, mandrills mostly eat invertebrates, particularly ants, beetles, termites, crickets, spiders, snails, and scorpions. It will also eat eggs, and even vertebrates such as birds, tortoises, frogs, porcupines, rats, and shrews. Mandrills likely will eat larger vertebrates when they have the opportunity, such as juvenile bay duikers and other small antelope. Large prey are likely killed with a bite to the nape with the mandrill's long canines. One study found the mandrill's diet was composed of fruit (50.7%), seeds (26.0%), leaves (8.2%), pith (6.8%), flowers (2.7%), and animal foods (4.1%), with other foods making up the remaining (1.4%).
Antelope Island
The island grasslands provide habitat for ring-necked pheasants, California quail, burrowing owls, chukar partridges, rock pigeons, mourning doves, horned larks, red-winged blackbirds and many other species, plus several species of raptors. Bald eagles, golden eagles, prairie falcons, peregrine falcons, northern harriers, American kestrels, great horned owls, barn owls, ospreys and red-tailed hawks are some of the species of raptors that can occur on the island.