The Javan rhino is one of the rarest large mammals in the world, primarily found in Ujung Kulon National Park in Indonesia. It has a single horn and a thick, folded skin that resembles armor. Adult Javan rhinos can weigh up to 2,300 kilograms and are known for their solitary behavior. This species is critically endangered, with an estimated population of fewer than 80 individuals. The main threats to the Javan rhino include habitat loss and poaching. Conservation efforts are ongoing to protect their habitat and ensure the survival of this unique animal.