Jungle horrors live on the island of Mos Le'Harmless, and use melee attacks that inflict a maximum of 84 life points. They appear in three forms - large-sized grey, medium dark green, and small light green ones, possibly a difference between males, females, and younglings. Jungle horrors can be assigned as a Slayer task by Chaeldar, Vannaka, and Sumona.
They have stronger relatives inside the caves on the island, called Cave horrors.
Jungle horrors can be ranged from the platform on the outskirt of the township, and bringing a long-ranged weapon such as a shieldbow helps as they can be scattered around before switching to another weapon such as a crossbow or a shortbow. The various jungle plants can be ranged across, and the jungle trees can be used as safe spots as well. Another good safe spot is the wheat field north-east of Mos Le'Harmless. Standing in the eastern edge of the wheat field is recommended, because they can't attack past the fence.
Melee can also be effective, because of their low life points, they can often be killed in two or three hits, reducing the need for food. In some areas of the jungle, there are three or four Horrors in the same area, which can be quickly killed right after each other.
Although it is reported that jungle horrors use range attacks, they seem to use melee attacks most of the time (and these reports are most likely as a result of a glitch where they appear to attack from a distance, but are in fact using melee). Thus, wearing good metal armour provides the best overall defence, much better than dragonhide armour, which protects against magic.
Players with high Defence do not need to pay much attention while fighting Jungle horrors. Since Jungle horrors are highly aggressive and can spot a player from quite a large distance, those players can simply stand in a spot with many Jungle horrors, with Auto Retaliate on, and kill them without even doing anything. Occasionally, players should check their life points and eat if necessary, which should not happen often as the horrors can easily be killed in two to three hits. Once the Jungle horrors become tolerant, players can leave the jungle and return to make them aggressive again.