Freshwater Snail
You’re probably wondering why a freshwater snail is one of the most dangerous animals in the world. Even though it doesn’t sound like a snail could harm a human, it can actually transmit a disease that, if not treated, may be deadly to humans. Imagine being taken out by a snail. They may transmit a disease called Schistosomiasis, which infects the urinary tract and intestines. It’s one of the world’s deadliest parasites, which is why the snail is so dangerous to humans. At the very least, we don’t have to worry about the snail biting or chasing us, but the fact that it carries this disease is scary enough.

It doesn’t necessarily get transmitted by direct contact with the snail, either, which is the scariest part about this animal. It’s transmitted through freshwater contact, contaminated with parasites that get into the human body solely by swimming in that water or accidentally ingesting it. The disease caused by this snail is most commonly found in developing countries where they lack the infrastructure to clean their water properly. Around 250 million people are infected with Schistosomiasis, and it mainly occurs in Asia (Far and Wide).