11.) The Bull Shark

Although the bull sharks aren’t venomous like the other animals on this list, this animal is one of the deadliest creatures you wouldn’t want to encounter underwater. What is even worse is that they like swimming in shallow water where people usually go. When they get disturbed or see a prey, they will immediately attack.

12.) The Common Lionfish

The common lionfish actually look stunning. It is covered with spines that resemble a lion’s hair. But, yes, despite its stunning appearance, it is considered as one of the dangerous sea creatures. Its spines are loaded with neurotoxins than can cause heartburn, convulsion, and immense pain to humans.

13.) The Smooth Toadfish

Smooth Toadfish appears like an ordinary puffer fish. It doesn’t look scary or have fangs and spines. But, it is not advisable to cook. This kind of fish is dangerous and can cause a problem when eaten. Some fishermen accidentally catch them thinking they are a harmless species.

14.) The Yellow Bellied Sea Snake

This kind of snake usually lives in warm oceans. Its length could be from 10 to 45 inches long. Although its venom is small, the yellow-bellied sea snake can cause permanent damage to the nerves. Immediate medical treatment is a must once bite by this snake. Without antidotes, a person could suffer paralysis or even death.

15.) The Funnel Web Spider

Australia is a home to various types of spiders. One of the species includes the funnel web spiders that are usually living in the forest. The poison of the funnel web spider can spread quickly to the body and cause death. Plus, it is regarded as one of the most notorious and creepy crawlers in Australia.