3. Bismuth crystals
Bismuth is a chemical element that obtains iridescent hues when exposed to air. While it is chemically similar to lead, it has an unusually low level of toxicity, making it an ideal replacement.
4. Ring-tailed cat
This mammal is not actually a cat, but rather a member of the Raccoon family, native to the southern parts of North America. They are said to make for affectionate pets who are also highly skilled at catching vermin.