Olm
Usually Found: Central & Southeastern Europe
The Olm species is one of the creepy animals that just makes your skin crawl. They are completely harmless to humans and will not bother anyone, but they are unsettling to look at for sure. Contrary to what you might be seeing, this is a salamander species. Like other animals on this list, the Olm is blind. The species does have eyes but they are underdeveloped.
That has resulted in more powerful senses to make up for the lack of eyesight, such as smell and hearing. It is also essentially lacking all pigmentation on its skin, and it can sometimes appear translucent under the right light. Unlike many other salamanders and even amphibian species, the Olm does not leave the water as it is entirely aquatic. Thus, it eats, sleeps, and even breeds completely underwater. They also live an incredibly long time, up to 100 years in fact!