Mike,
Your alligator's brain can only handle so much associative stimulus , so you need to change the association in a clear and simple manner. This is easy to do, but requires repetition and consistency. keep in mind that crocodilians, like people, vary in their mental capabilities, so one alligator in a seperate enclosure may respond more slowly or quickly to identical conditioning procedure.
You can employ an audial(sound, visual or spatial association, or even combine them, at feeding time. Here are a few examples to get you started:
Audial: Grunt like an alligator.
Visual: Use a white food container that is placed in his enclosure (in the same general spot - see below) as you draw food from it.
Spatial: Always feed only from a specific spot in the alligator's enclosure(this example is more difficult with smaller enclosures), and avoid approaching it from that spot during non-feeding interactions.
In the examples above, your gator will likely realize in time, that when you approach his enclosure without a grunting noise, and/or without a white bucket, and/or from a non-feeding spot, then it is NOT dinner time. Some crocodilians will even associate the color of your shirt, or a baseball cap on your head, with feeding time, if such stimuli are consistent!
If you break your own rules of conditioning him, you could spoil all your efforts -- consistency and self-discipline are important. If there is someone else living with you who has access to the animal, make sure the follow the rules.
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Israel Dupont
Winter Haven, FL