The Bali was also the smallest tiger sub-species. There is no record of a Balinese tiger ever being held in a zoo collection. The Balinese tiger's close sub-species were the Javan tiger and the Caspian tiger, which are now also extinct. The Balinese and Javan tigers were once the same, but during the Ice Age, Bali became isolated from Java by the Bali Strait. This split the tigers into two groups which then went onto develop alone. 