|First appearance||Life in the Underground|
The Ahool is a large, gray-furred, winged monkey. It made its first appearance in Life in the Underground.
It was a lookout for the other cryptids. It was seen in Indonesia and Java. It has four arms, but two of its arms have evolved into wings. It has been known to attack people. It is also said to have an eerie sound of "Ahhhooooollll", that it makes while gliding through the rainforest. Zak uses them as soldiers in War of the Cryptids.