“1 In 2,000,000”: 46 Animals With Rare Genetic Mutations That Don’t Even Look Real (New Pics)

Genes are short sections of DNA that determine an animal’s traits—everything from coat color and claw strength to body shape and health. But sometimes, these genes mutate. And while the word itself sounds alarming, most mutations are harmless and invisible. The more noticeable ones, however, can produce features that are quite rare for the species. To give you a sense of how these fascinating genetic quirks show up in nature, we’ve put together a gallery of animals — from cats and mice to crabs, penguins, and beyond — each displaying traits that make them stand out from their peers.