A foul stench, which can be likened to that of decaying pumpkins, constantly lingers around Jacko eggs. The foul odor will become progressively worse up to the moment they hatch.
The Jacko species is the unsavory rejected leftover from the selective breeding process of Scarrows, having managed to escape into the wilderness and reproduce on their own. They enjoy harassing farmers by hiding in Kinump patches.
Notoriously mischievous, the Jacko's personality is contrary to the Scarrow's feistiness and the Kinump's friendliness.