The idea of a poisonous animal evolving a warning device that will work only if a potential enemy also evolves the sense to react to the warning is hard for some people to accept. I do not know why this should be so. Besides logic, a great store of anecdotal evidence supports its reality. Nearly any mature Florida bird dog, for instance, reacts instantly to the sound of a rattlesnake. While it is hard to be sure what a dog has learned from previous experience or from other dogs, it can in most cases I know about be confidently said that the learning  process did not involve being bitten by a rattlesnake. A pointer I used to hunt with in central Florida, though it had never been bitten by a poisonous snake in its life, showed unmistakable evidence of associating the rattle with a particularly odious situation. In its quartering for quail, if you saw it suddenly jump into the air and you went to the spot to see what had scared it, one of two things was most often there – a coiled diamondback, or a bush of a certain species of Crotalaria, the dry pods of which rattle when disturbed, almost like a rattler’s alarm. Only one of the several species of Crotalaria sounds authentically like a snake, and only that species used to make my dog jump. But the effect of a collision with that was electric, and for all the years of its life the dog rose like a bird when it stirred the fearful noise from a diamondback or from the bush that I think sounded the same to the dog.

That is of course not a scientific observation. It involves a subjective judgment on my part, and the behavior of only one dog. And it in  any case leaves unanswered the question whether the reaction is innate in canines or is learned by associating the sound of the rattle with the bites or aggressive behavior of snakes in general – or is learned from other dogs. That dogs are or Old World, and rattlesnakes of American origin, makes it seem unlikely that the pointer was born genetically able to associate the sound with the snake. On the other hand, the buzzing of rattlesnakes is really just an elaboration of a tendency of many kinds of snakes to vibrate the tail when approached by a potential enemy. The vibration is often soundless, but in dry leaves it makes a little rattling or humming noise. Possibly dog ancestors evolved the capacity to associate such a sound with ill-tempered or dangerous snakes. But the important point is that the rattle of the rattlesnakes makes little sense unless it can be thought of as an agent of advantage to the bearer. And the advantage in not being stepped on by a bison or chopped up by the teeth of a wolf seems pretty clear. That the bison and wolf might go away poisoned and die would be little comfort to the snake. Its profit would come from preventing the encounter from happening.

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Iguanas cannot change their color like chameleons, but coloration and pattern will become more vivid under natural sunlight or broad-spectrum fluorescent light.
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