Why Did The Javan Tiger Disappear ?

The Javan tiger (Panthera tigris sondaica) is an extinct tiger population that lived in the Indonesian island of Java until the mid 1970s. It was one of the three tiger populations limited to the Sunda Islands.
The Javan tiger was small compared to other subspecies of the Asian mainland, but larger than the Bali tiger, and similar in size to the Sumatran tiger.
Based on these cranial differences, the Javan tiger was proposed to be assigned to a distinct species, with the taxonomic name Panthera sondaica.
Males had a mean body length of 248 cm (98 in) and weighed between 100 and 141 kg (220 and 311 lb). Females were smaller than males and weighed between 75 and 115 kg (165 and 254 lb).
At the end of the nineteenth century, Javan tigers inhabited most of Java. Around 1850, people living in rural areas still considered them a plague.
By 1940, tigers had retreated to remote mountainous and forested areas.
Around 1970, the only known tigers lived in the region of Mount Betiri, with an altitude of 1,192 m (3,911 ft), the highest mountain in Java's southeast, which had not been settled because of the rugged and sloping terrain.
In 1972, the 500 km2 (190 sq mi) area was gazetted as wildlife reserve. The last tigers were sighted there in 1976.
Up to World War II, Javan tigers were kept in some Indonesian zoos, but these were closed during the war. After the war, they were so rare that it was easier to instead obtain Sumatran tigers.
It went extinct around 1980s.