User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-1921299-20141003023601/@comment-5428752-20141003122540

Kushala tends to appear in certain areas with climatic properties, cold montains, warm jungles and hot deserts.

Thinking of that, I dunno why kushy don't travel in volcanoes, or maybe "not in game"?