How do they control the animal? However, I'm going to point out one of the most significant parts and forgo mentioning the rest of it for now.
Everywhere that Luffy has been, people have been liberated from their oppressors and Luffy has done his utmost best to restore the smiles on their faces.
Its much closer to Bentham's silhouette.
Ethnography of the Bikol People.
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Specifically, he showed the ability to both hear and command a type of animal.