Sumatran tiger shot dead, another on the loose, after killing zookeeper and escaping Borneo zoo Posted SatSaturday 6 updated SatSaturday 6 Fewer than 400 Sumatran tigers are believed to remain in the wild. ( Share Print text only Cancel A critically endangered Sumatran tiger has been shot dead while another is still on the loose after they escaped from a zoo on Borneo island, killing a zookeeper. Key points: Rain caused a landslide opening up a tunnel that allowed their exit A zookeeper, a cassowary, an ostrich and a monkey were all found dead near the cage Authorities attempted to tranquilise one of the tigers before shooting it dead