Sumatra 7 ethnic gr. But ladang persists as a source of food, supplementing rice cultivation. The inhabitants of Mentawai and Engano islands have some agriculture though hunting and fishing are very important activities. Activities are slash and much cultivation, hunting and fishing. Wild sago is used and transplanted.
Fruit trees are important for the agroforests and serve as bait for animals that they hunt.
The big ethnic groups of cultivators On Sumatra, there are both irrigated rice fields and swidden gardens. Fresh water fishing is also an important activity.