I don't. Some reptiles and indigos have irregularities in subcaudal scales, an occassional divided or undivided one. That seems like a good way to photo/document an animal, and I know field biologists often mark animals by clipping notches in these subcaudal scales, assigning a number etc. Realistically, I can't imagine getting an animal back if stolen, except on your own terms. It would be real tricky getting Probable Cause to scan someones animal for a chip...can you imagine the average Police Officer/Animal Control officer getting a warrant to scan a collection hoping to recover your stolen property? To the lay person, Drys look pretty much the same. I may be missing an important point, and I would like to hear WHY people think chips are effective. Tortoise keepers often do this. (BTW, I have chips in my dogs, because many VETS and animal controls DO routinely scan lost/recovered animals) and I do see the need to document if/when someone sets up a stud book. vic h.