Dayaks being accustomed to living in jungles and hard terrains, and knowing the plants and animals are extremely good at following animals trails while hunting and of course tracking humans or enemies, thus some Dayaks became very good trackers in jungles in the military e.g. some Iban Dayaks were engaged as trackers during the anti-confrontation by Indonesia against the formation of Federation of Malaysia and anti-communism in Malaysia itself. No doubt, these survival skills are obtained while doing activities in the jungles, which are then utilised for headhunting in the old days.