Stonefish
These fish are highly deadly, making them some of the most dangerous animals in the world. They love lurking in tropical seas. Unfortunately, they’re hard to spot in the ocean, especially because they lurk around rock and coral and easily blend into the ocean floor. That’s how they earned the name stonefish since they look like a stone. Visually, they’re very similar to rocks, sit perfectly still, and blend into the surrounding ocean floor. If you happen to be walking into the ocean, it’s highly unlikely you’ll see a stonefish. But once you accidentally step on it, you’ll know right away. When someone steps on their dorsal fins, the stonefish releases potent neurotoxins. The harder you step on the stonefish, the more toxins and poison it releases into your body.

Additionally, if you’re extremely unlikely, you’ll trigger the stonefish’s defense mechanism known as a lachrymal saber, which has been known to be similar to a switchblade straight on the face. Because the position is so toxic and lethal, victims must receive anti-venom within an hour. In the meantime, you have to apply heated water to the wound to draw out the toxin. To prevent this chaos from even happening, it’s best not to walk around in the ocean where there’s a lot of coral, or to wear water shoes in case you do happen to step on one (CNTraveler).