Deforestation is a major problem for fauna such as tigers, as the forest is cut to make room for plantations, mostly for palm oil and other cash crops. The orangutan population has dropped by 40% in the last 20 years. Hunting has also been an issue. Animals such as the Asian elephant have been forced out of their habitat due to its loss, often leading them to starve. Once so common that complaints existed of them trampling people's gardens, Sumatran rhinoceroses are likely to become extinct in Malaysia. Hornbills are steadily declining in numbers. Most remaining forest is found inside national parks.