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Top 10 Most Dangerous Sea Creatures You Should Avoid

If you or a family member is going to be traveling, or by the ocean for any reason, there are some dangerous sea creatures that should be avoided at all cost. Some sea creatures may only somewhat dangerous, while others can be extremely dangerous, and even deadly.

There are several different classifications for dangerous sea creatures, so you should be aware of what is likely located at the time and location you will be located. Some are classified by the water level they live in, while others are classified by their attack methods or their species types. Depending on when and where you are likely to encounter dangerous sea creatures, will determine what type of sea creatures you’re likely to encounter, so you can prepare and keep an eye out for.

10 Most Dangerous Sea Creatures

1. Stingray

Stingrays are a group of fish that have a barbed stinger on their backside, these are only used in self-defense, but if you encounter one of these, they may use that stinger even if you are causing the stingray no harm. Stingrays have several different sub-classifications; therefore, stingrays can be found in numerous bodies of waters and locations.

Many stingrays are camouflaged to blend in with the ground under the body of water they reside in. If you are in the ocean, many stingrays are the same color as the sand, which protects the stingray from predators, but also makes it harder for you to see and avoid.

Death caused by being stung by a stingray is unlikely but possible. There have been cases of others being killed by stingrays, but in those case, the person was pierced by the stinger in a vital area. If you are stung by a stingray, you should immediately travel to the nearest hospital, but most likely, your life is not in danger.

2. Sea Snake

Sea snakes, or also known as coral reef snakes, that look like common land snakes, but live in water. Typically, these sea snakes cannot travel onto land, so you are likely only to encounter these when in the sea.

Although sea snake bites on humans do not happen every day, sea snakes can bite. If, and when, they get out of their natural habitat, the sea, then they may be more likely to attack humans. If you see anything you believe to be a sea snake, on dry land, it is best to keep a good distance as there is a chance of danger.

The importance of staying away from sea snakes both in the water and on land is increased because of the venom of sea snakes. Most sea snakes are highly poisonous, with venom that can cause great hardship, and often death. If you are bitten by a sea snake, it is critical that you get to the nearest emergency medical facility as soon as possible. Often, the time it takes you to get medical help, will determine how well and fast you recover.

3. Barracuda

Barracuda

Barracudas belong to the ray fish family and look like any other fish you would see in the ocean. They are known for their overly aggressive behavior and if you see one, you are that aggressive behavior is likely to be very apparent.

Barracudas may somewhat resemble snakes, but more so like a fish. The danger of these fish is the high likelihood being attacked if you are in the water with one. Barracudas have extremely sharp teeth that can cause great harm, and again, possibly even death in some circumstances. Likely you are to avoid death, but it is still best to avoid barracudas as much as possible because there is still a high likelihood of extreme injury.

They are often located in deep waters of the ocean, but they are extremely fast fish and can move from one location to another, in a short amount of time. If you are traveling, it is important to understand what sea species may be around.

4. Moray Eel

Moray eels are saltwater creatures, but in some select circumstances, have been known to be in freshwater or brackish water. They come from the eel family and are hundreds of sub-species know the moray eel.

They reside in warm climates and tend to stay around reefs. Many encounters between humans and moray eels encounter when people go diving. These dangerous sea creatures have extremely sharp teeth that can cause extreme pain and harm when biting humans.

Very few of these are located outside the trips, therefore it is easier for you to know where you are likely to encounter these creatures, and also something to keep in mind if you will be diving in tropical climate waters.

5. Cone Snail

Cone snails look like any other snails, typically found ins shells on the ocean floor. These creatures can be small making them hard to see, but they can actually become large. These species are extremely poisonous and contain poison that can be life-threatening to humans.

Being attacked by a cone snail is actually considered being stung, even though, there is no apparent stinger that will stand out and be visible to you. Under no circumstances should you attempt to pick up anything that may possibly be a cone snail, even if you think there is nothing in the snail shell, you should still not pick things up off the ocean floor.

6. Stonefish

A stonefish is considered by many to be one of the most venomous fish in the world. If you are poisoned by one of these fish, it is likely because you have come into contact with their fins. Their fins are sharp and give off their extremely poisonous venom.

These fish are most often located in the ocean but have been known to live in rivers and streams. They blend in with stones located in their natural habitat. As they blend in with stones, if you encounter one of these dangerous sea creatures, it is likely to happen in an area with many stones and other rocks in the water.

You will know if you come into contact with a stonefish, their fins and venom will be extremely painful, and impossible for you to not realize. In this instance, it is highly important you get to a medical treatment facility immediately. There have not been many documented cases of stonefish encounters, but when they do happen, it is often not good.

7. Saltwater Crocodile

Saltwater Crocodile

Actually, the largest reptiles on earth, saltwater crocodiles are extremely dangerous and very common. They look like any other crocodile you may have seen, and also similarly resemble alligators.

These predators have been known to attack humans if they are encountered, these creatures have extremely sharp teeth, paired with intense jaw strength. If you are attacked by one, it is likely your life will be in danger. They have been known to attack and kill small humans and children, they can be located in shallow water and deep water, while also being able to venture onto land. These animals may not attack, but there is no room to take the chance. You should know where these are located are traveling, and also take every measure to stay away from them if you know they are around, or if you see one.

8. Tiger Shark

Tiger sharks are extremely aggressive and dangerous species from the shark family. These are located mainly in tropical waters, and often in middle to deep waters. Smaller ones and some may travel into shallow water, therefore you should be aware of these and any other sharks any time you will be in sea water above a few inches of water.

If you are diving, surfing, or in deep ocean waters for any other reason, this is when your risk of being attacked by a tiger shark is increased. If you are attacked by these dangerous sea creatures you are likely to have great harm. Many times, people lose their lives, and others may lose limbs or have extreme permanent damage.

9. Blue Ringed Octopus

Blue ringed octopus happen to be the most poisonous sub-species from the octopus family. They are smaller than you may think, often only being 5-8 inches in size, but they are still one of the most dangerous, and most venomous creatures you can encounter in the sea.

These creatures are camouflaged to blend into their environment, they may have bright colors and attract attention, or could blend in and be hard for you to spot from a distance.

When many people are attacked by the blue ringed octopus, they do not even realize they have been poisoned. The bite by these species many times does not come with any feeling, and the venom is so poisonous, the result is not good for the victim. 

Because of the extreme danger, and the unlikelihood that you will know you have been attacked in time to seek medical help, it is even more important to stay away from blue ringed octopuses. The fact of not knowing you have been attacked is what makes these dangerous sea creatures so dangerous.

10. Box Jellyfish

Box Jellyfish

Some box jellyfish are venomous, and some are not. Still, you should take every precaution you can to avoid these dangerous sea creatures. Even if the specific creature you encounter is not poisonous, being attacked by a box jellyfish will still be extremely painful to the human.

Box jellyfish actively move, unlike other jellyfish that drift. Therefore, the danger is increased because they may move toward you. They are located in warm climate water and known to be in all depths of water. They can range in size, and some may be easy to spot, while others, particularly the smaller ones, may be harder to see and more dangerous.

If you will be traveling in waters where box jellyfish may be located, you can protect yourself by wearing the proper gear. Many times, divers and other that will be in the water, can water clothing that will protect them from jellyfish attack. Box Jellyfish can be just as dangerous as any their dangerous sea creature in the world, but more steps can be taken to avoid them, possibly than some of the other more dangerous sea creatures.

Tips for Sea Traveling

If you will be traveling, or you live in an area near large bodies of saltwater, it is best that you understand what sea creatures are in the area, and how best to protect yourself from them. If you live in the area, you may have more knowledge of the local sea special, but if you are traveling, it is even more important to research and understand what will be around your travel destination.

Many sea creatures can cause great bodily harm, and in many cases, even death to humans if attacked. Some of these creatures are more passive and will only attack in the even they feel they are acting in self-defense. But still many species are aggressive. Some possess highly poisonous venom that can cause permanent damage and even death if you cannot get to a medical facility immediately.

Because of the wide range of species, you could possibly encounter, and the dangers these species can cause means you must understand the most dangerous sea species, where they are located, and how to void them.

Drake

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Drake

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