They are all individuals, each with its own personality. None of my Yellow Anacondas has developed an aggressive feeding response, so far. I handle them every day, and have never had one go into feeding mode unless they smell food, so far. When I feed them, I thaw their food in the room with them. After an hour of smelling their food defrost and warm, they're ready to eat. I feed them wherever they are at mealtime. Usually, that's in the water, but not always. I feed adults at 4 to 6 week intervals, so they're good and hungry by feeding time. I feed smaller food items than the maximum size they can handle, and I feed them until they aren't interested in any more. When I'm done feeding them, they are satisfied and their feeding response is gone. If I had any aggressive individuals, I would modify my feeding technique for those animals.
I've been working with this guy since he was born, over five years. I would not try this with any large constrictor I didn't know this well. He sometimes strikes at the first one. Usually though, he just opens up and takes them. It takes 4 to 5 of these 1/2 pounders to fill him up.

He's already had a couple before this shot, so he'll just open up and let me put it in his mouth.

When he's full, he'll play with the last one, sometimes discarding it.

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To Buddhist hot dog vendor. "Make me one with everything."