Diane said..."Also, since many chameleons do not eat plant material, some potentially "toxic" plants are probably fine as well"...but if the insects nibble on the leaves of a toxic plant and then the chameleon eats the insect, what will happen?
Eric said..."Unless we have cultivated it for food purposes, it's probably toxic in some sort."...we would think this to be true, but even plants and some of their parts that we cultivate to eat are poisonous. Green potatoes are not good for us, pips/seeds of cherry, apple, pear, apricot etc. contain toxins.
Eric said..."I can almost assure you that the plants chameleons live on in the wild are not on the safe plant list" that's probably quite true, but there might also be some "mechanism" that prevents them all from dying or from eating them or insects that feed on them.
Eric said..."See that large leafed plant? Sheffelera actinoflora - our friendly dwarf sheffelera's evil cousin. Supposed to make birds puke if they eat it. It was my favorite plant for several years"...chocolate and onions are okay for humans but not for dogs, for example...so I think that what we have to realize is that whatever list we look on for non-toxic plants, unless its specific to one species, could contain plants that don't belong there.
Eric said..."Poisonous plants tend to taste like poison. The toxins are there not to kill the browser, but to prevent them from eating the plant"...wile this may be true for some plants then, for example, why do people die/get sick from eating poison mushrooms?
Some animals may only ingest a little bit of a plant, which serves as a test. It the animal doesn't get sick or die, then it could eat more of it the next time....but I'm not sure how many animals have that ability.
This site has some points that should be of interest in this discussion... http://www.tortoisetrust.org/articles/Plantoxins.htm
And another site....
http://www.anapsid.org/resources/plants.html