In winter , the gaur , the world 's largest wild ox , almost 2 m ( 6 ft ) high at the shoulder , comes out of its hideaway in the Siwalik Hills on the park 's southern edge in search of young grass .
In winter , the gaur comes out of its hideaway in the Siwalik Hills on the park 's southern edge in search of young grass because it is the first area to thaw .