Nature is full of beauty and horrors in equal measure. Some animals may look perfectly sweet and harmless, but when they open their mouths, that illusion is over in an instant! Just the mere sight of their oral cavities can make you flee the scene. For example, the jawless sea-lamprey has a scary suction-cup mouth that’s ringed with rows of knife-like teeth. Plus, its tongue is abrasive enough to cut through any kind of skin! And the inside of a sea-turtle’s mouth may be the most terrifying image ever.
Trust us, you never want to come across this in real life. The kind of funny-looking Mandrill has 2.5 inch long canine enamels that make it look extremely menacing. And then there’s hippos, who can open their jaws up to 180 degrees or 4-feet wide. Their massive, powerful canines and incisors can literally cut a human body in half! The common black devil, or the anglerfish, has a mouth so big that it can swallow prey up to twice its size. This, plus their long, sharp fangs give them an almost alienesque appearance.
Lamprey

The lamprey is a scary-looking animal notorious for its jawless mouth and circular rows of sharp teeth. These eel-like creatures feed by boring holes in the flesh of an unsuspecting animal. Once it’s caught its prey, it then sucks its blood. Lampreys aren’t afraid to target fish bigger than them in the ocean, in fact, they’ve even been known to grab onto specimens as big as sharks.
There have been reports of lamprey attacks on humans, but, overall, they prefer fish and won’t attack us with the same ferocity as they do aquatic creatures. We can imagine a lamprey attack being a dreadful way to leave this planet.
How to find them? There are many species of lamprey worldwide, and most of them are either in the United States or Canada. The sea lamprey can be found in the open oceans of the North Atlantic and the Mediterranean, and other major lakes in North America. On the other hand, the silver lamprey can be found in the Great Lakes, Mississippi River, Ohio River.
Sea Turtle

Leatherback Sea Turtle is the largest of all living turtles. they also known as lute turtle or leathery turtle. They can be found in all tropical and subtropical oceans, and its range extend well into the Artic Circle.
They may seem friendly, but who would have thought behind their friendly looks, they have a very creepy mouth. They have hundreds of sharp teeth that resemble thorns called papillae all the way down to their gut. Although it looks scary, their creepy mouths are very useful. It’s like a food-crusher for them.
Their favorite food is the jellyfish. So, those creepy teeth that help them not to sting by the jellyfish tentacles. and those creepy teeth help prevent the slippery body of jellyfish from coming out of their mouths when they eat it.
Sarcastic Fringehead

Sarcastic Fringehead Blennies live in the ocean off the coast of California. Similar to Predator, they flair their jaws to intimidate others while defending their territory and home
The sarcastic fringehead is one of those funny fish: this bad boy is feisty, quick-moving and rather amusing to watch, so long as you’re not in the line of his prey.
Discovered in 1858, this super aggressive little guy grows only to about 12 inches in length with a long and slender body, large pectoral fins and much smaller pelvic fins.
This fish is known for being very aggressive and territorial. They are big fighters. When two fringeheads battle for territory, they press their swollen mouths together. It looks like kissing, but they are actually determining who is the larger fish. The larger fish – or the fish with the larger jaw – win dominance.
Goblin Shark

Described as pinkish and flabby the goblin shark can measure over 20 ft (6m) in length, although 10 to 12 ft (3-4m) is more common. These sharks inhabit the twilight zone at depths greater than 300 ft (100m) where they slowly hover looking for prey to ambush. This is where that outlandish snout comes into play as it is covered in special sensory organs (the ampullae of Lorenzini) which help detect the electrical fields of other organisms.
It is only when prey has been detected and the goblin shark strikes that it takes on its most grotesque appearance. With its jaws shut the shark looks merely odd. However, when the shark attacks it can shoot its jaws forward which then protrude almost as much as the snout revealing a set of particularly long and sharp looking teeth.
As is the way with many of the strangest looking animals, the goblin shark is an evolutionary throwback, little changed for 125 million years.
In the video below, you can see Animals Have The Scariest Mouth On The Planet You’ve Never Seen
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Video resource : Facts Junkie