They feed the alligators protein pellets. If they didn't feed the alligators then they would not come out near the boat. They would likely not come out where they can be seen at all. Let's be honest here. People who pay to go on a swamp tour want to see the alligators. So trying to make pets? No just making a Great Swamp Tour!
They feed little pieces of hot dog on sticks to get the alligators to come close to the boat.
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