Where do I begin? There are so many issues and nuances involved in your last two responses to me.
I know I don't have all the answers, but I do have a pretty extensive background in animal behavior and training having studied under some of the best in the world. The people I've worked under consult with zoos and the like all over the world to set up training programs to do things like get a 200 pound tortoise to willingly offer it's body for painful medical procedures without any restraint or develop strategies to get tigers to race into their holding cages should there be an emergency such as another escaped zoo animal ending up in the tiger enclosure. If you've ever seen the bird show in Disney's Animal Kingdom in Orlando or the fantastic bird show at the Texas State Fair, those are the people I mostly trained under.
This is going to be a long post, and I hope you bear with me on it, keeping an open mind. I don't pretend to have all the answers or know everything about chameleon behavior. What I do know is that there can be incredible damage done to an animal simply by mishandling it and stressing it be it through forcing it to be in close contact with people or keeping it in conditions that are outside of the parameters the animal evolved and thrived in the wild.
I believe that very few on here have honed their observation skills of the behavior of any animal and don't even recognize the subtle physical responses to stress or even fear. Again, that's not a slight--it takes a systematic approach to
observing, recording and testing any hypothesis of a behavior. That systematic approach usually needs to be taught before one can support their hypothesis of what an observed behavior actually means. That's not a criticism. It is a real skill to be observant of the very subtle behaviors, the "body language," of any animal especially an animal that lacks feathers, fur and facial muscles. I am not an expert at identifying those behaviors in chameleons and what they mean either, but I also know that I don't know. I learned under professional trainers how to observe the body language of other species and not to apply my human responses to another species. Please believe that I am not being arrogant with that statement. Let me try to explain.
Most of my work has been with parrots. I think you can even buy a book or two written for the lay person on interpreting the body language of parrots. You can learn a lot about the mental state of a parrot by observing them just sitting on a perch. Here are some of the things you can look at in a parrot:
How high are they standing on the perch, in other words is there a lot of space between their body and the perch or are they close to the perch;
How much of the beak is visible, are the feathers on their face fluffed forward covering much of the beak;
Are the pupils of the eyes dilated or contracted or are they "pinning" which means the pupils are rapidly opening and contracting many many times a minute;
Are the wings held loosely at their side or tight to the body;
Are the feathers held tightly, "slicked," to the body or loosely;
Are the feathers on the head slicked down or open and fluffed;
Are the head feathers erect, displaying;
Are the feathers loosely covering the feet;
Are the tail feathers spread.
The list goes on. If you take a photo of a bird on a perch, you can get a lot of information of the inner workings of that parrot at that particular moment in time. It helps greatly that they have feathers that can be raised or clamped to their body, just as mammals have fur that can be raised or slicked. Chameleons do not. Also helpful is the number of people who have worked with parrots, so there is a wealth of documented experience with their behaviors.
The same cannot be said about chameleons. They pose many problems for the astute observer if only just for the fact they have no facial muscles or feathers/fur. There isn't much research on their behavior in the wild. The little research in the field seems to be limited to where they are found, how dense their populations are and their physical attributes such as size, color, scalation, etc. There isn't a lot of research of their behavior in the wild (
@Chris Anderson please correct me if I am wrong and direct me to the research). Complicating everything, the "stress" behavior pet people observe and report on internet forums such as this one--and bear in mind, they might not even be observing stressed behavior--is often so far past the very beginning of an observable stress response. (As an example of confusion within the pet community, think of the number of novices who write in about their chameleon doing normal basking behavior of turning dark and flattening out to the light and being told it is a stress response by another novice.)
There are basically two main types of training styles. One style uses force and pain/fear to get an animal (including humans) to comply. It can be subtle and not terribly significant to the animal, even an extension of the natural behavior for that species, such as digging your elbow or knuckles hard into the ribs of a horse to cue it to move away from you. Or, it can be quite painful/terrifying such as using a cattle prod to get the same response. (Electrical shock is by far the most aversive stimuli there is to animals based on research.) This kind of training uses escape/avoidance strategies of the animal to get the behavior. The animal is usually trained what not to do with the use of aversives.
The other school of thought is to set up the environment to get the animal to comply by choice. The animal is cued to behave and chooses to perform or not. The training is set up so that you empower the animal to change (operate within) it's environment. This is known as operant conditioning.
Both training styles can be stressful for the animal. The first, with the application of pain and fear. The second with the stress of trying to solve the puzzle of a training problem. Or setting the alternatives to the behavior we want as worse than complying. At the extreme end of positive reinforcement-only training is giving the animal the choice to perform the behavior or starve to death. Take my wild caught at the vets--he "chose" to seemingly calmly climb up on my hand rather than stay low on the edge of his little travel tote on the examining table with two giant chameleon-eating predators hovering over top of him. Of course he chose the unknown risk of climbing on my hand over staying exposed to the predators and being eaten.
Why does all this matter? Simply because many people on this forum and other internet forums are advising how to "train" chameleons to be tame and will unwittingly recommend methods that are in fact quite detrimental and stressful to chameleons.
Keep in mind, stress in chameleons means a suppressed immune system which results in poor health down the road. Also note that some stress is not all bad. It is the degree and the cumulative effect of stress one must be aware of.
Stress suppressing the immune system is a fact. Chameleons dying at a very young age in captivity is a fact. Wild caught chameleons come into the country with horrendous but healed injuries yet had gone on to grow and thrive in the wild after the injury. Wild chameleons also have a parasite load that most cope with just fine and appear in perfect health. Those are facts. So, it is obvious that how we are keeping chameleons in captivity is causing poor health and an early demise. We can't lose sight of that--something we are doing is really hard on chameleons. I do not for a moment believe it is one single thing, but a myriad of factors, and stress is a biggie. Stress absolutely suppresses the immune system. I read countless defenders of those that believe they can be family members and handled like a dog yet I also read posts from those same people who are asking for your prayers because their young chameleon is ill and dying even with top-notch veterinary care. We have to be honest about what we are doing to them.
You question my techniques to raising chameleons which is not much different than any other successful breeder would raise them. Perhaps "tame" is too loaded a word to use with chameleons. I have wild caught chameleons come running to the front of the cage when I enter the room. They are not terribly afraid of me. They have learned that I am the bringer of good things, food. But, they most certainly don't trust me.
Others have criticized me by claiming that since I try to minimize handling them, I know nothing of their true nature. Or, how can they learn to be tame when I don't give them that opportunity by forcing interactions with them. Force is the correct term to use simply because no chameleon has a social structure with their own species so they have no drive to establish one with humanity to replace their social relationships with their own kind. I do know that I am doing something right with them because I have so few deaths of wild caughts, regardless of their poor health status at arrival in my care.
I think you and most keepers are confusing a chameleon's lack of observable reaction to stimuli (such as your presence/handling of it) with a it not being stressed. Just because you you do not recognize a response doesn't mean it isn't there. The response might be observable only if you took a blood panel and measured things like stress hormone levels at the time or recorded the heart rate. My wild caught chameleon at the vet did not seem stressed. There was no flight or flight response, his color was normal "happy" colors, he wasn't frozen in fear and he was interacting with his environment. Yet I know he was stressed--he would have been brain dead if he weren't. At some point, I would like to really study chameleon behavior as it relates to stress, especially to fear. What is the very first physical response to stress/fear? What is the chameleon equivalent to a parrot, slicking it's feathers tight to its body and standing tall on a perch? At some point I will.
I believe we do a disservice to chameleons and their owners when we suggest it is possible to have a rich two-way relationship with a chameleon. I am sure there is the a chameleon and owner combination that can, but I think it is extremely rare and very much outside of the normal of what can be expected of chameleons.