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Hootstacks resemble owls hiding in a tree trunk. They can be found piled from two to four owls to form a single trunk, slowly moving forward and backward. One Hootstack always has its face revealed, but they alternate position over time.
Hitting a revealed Hootstack disassembles it from the group and prompts it to attack alone by small rapid jumps forward, thanks to its hidden wings. Hitting any other Hootstack prompts the whole group into attacking.