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Reading the thread named "Hippo farming in the USA?", I just had an idea. What if humans domesticated or herded sea cows?
Manatees are gentle and slow-moving. Most of their time is spent eating, resting, and in travel. They may rest submerged at the bottom or just below the surface, coming up to breathe on the average of every three to five minutes. When manatees are using a great deal of energy, they may surface to breathe as often as every 30 seconds. They would be easy to herd. They are also herbivorous.