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It's not an acorn, it's a Messen egg!
When a Messen first hatches, its first task is to find its Forever Acorn that it will wear on its head for the rest of its life. The quality of this acorn must be thoroughly investigated by the Messen; it must be free of fractures, thin spots, and be of adequate size to grow into. Once the Forever Acorn is acquired, the Messen can begin to live its life freely. Messens can take up to two and a half years to find this acorn, although most find theirs in the first 9 months of life.
One reward for finding the Forever Acorn is that, once found, Messens never need to collect acorns or other nuts to store for the rest of their lives. Instead, they live off the generosity of humans that feed them as pets.