Bali is home to 32 species of mammals, including a wildcat, two species each of civet (the 'musang' or palm civet, which resembles a mongoose), two species of monkey, 'sambar', barking deer, mouse deer, wild ox (banteng), and a miniature squirrel.
In the early 1900s, a writer reported that his camp in west Bali was trampled by a herd of feral elephants, but by the 1920s it was difficult to meet anyone who'd ever seen an elephant on the island. By that time the Balinese tiger, the smallest of eight subspecies of tiger, was very rarely sighted, and the last known animal was shot in 1937. Today only five sad stuffed specimens are left behind.
A visit to the 76,000-hectare Bali Barat National Park (BBNP), covering most of the heavily forested interior of western Bali, is obligatory for animal and bird lovers. The park is effectively protected against exploitation and development and is well-patrolled by rangers based at the park headquarters of Cekik and Labuhan Lalang.
Here you can see 'rusa' deer, wild boar, and fairly tame long-tailed macaques and leaf monkeys sitting high in the trees chewing on leaves. The 165-hectare offshore island of Menjangan has a population of around 50 barking deer.