Nature can be pretty scary sometimes when it decides to show its raw power and ferocity but nothing quite matches up to some of the horrific creatures that existed in the pre-historic ages and once roamed the earth and seas of this very planet. Here we look at 10 of the most terrifying things to have ever existed including the Kaprosuchus.
Nicknamed the boarcroc, this giant croc that grew up to 6metres (20ft) in length and could walk rapidly on land as well as swim through water with ease is simply horrific. Basically, imagine a crocodile the size of a small truck, that can run after you and you get the picture.
Turtles aren't scary, right? Of course not, unless they're big enough to feed off of crocodiles and can live on both land and water. Fortunately, this fella' existed over 5 million years ago so you won't be running into him anytime soon.
A giant millipede that was around 6 meters (20 feet) in length. With an armor-plated back it was well defended but, unlike previously thought, research suggests it was a herbivore and so lived mainly off of plants.
A carnivorous scorpion that could walk on land and live under the sea, this thing was about a meter long and had a stinger the size of a lightbulb.
Another type of sea-scorpion, this one is even bigger at around 2.46 meters (8.1 feet) thus making it the largest scorpion in history. Existing around 390 million years ago, despite being called a sea-scorpion, it most likely lived in rivers and lakes, living off fish and other water dwelling creatures.
A pre-historic shrimp so large that, when first discovered, it was thought that the tail, mouth and feeding appendages were separate creatures. About one meter long, its mouth was constructed in a circular fashion with serrated teeth all the way down its gullet, it would crush its prey before digesting it. About 515 million years old, it is a distant cry from present day shrimp.
There were clearly a lot of giant scorpions around before we were as this one was a land living one around 70cm long and probably ate insects and lizards.
A giant squid with a hard shell it was much like a cuttlefish that existed 485 million years ago. Estimated to be between 6 and 9 meters in length, and with massive tentacles that ensnared its prey, it is basically like a real life Kraken!
A 60 million-year-old boa constrictor that was the length of a bus and was an apex predator, this snake is the largest ever discovered and ruled the jungle and forest areas it roamed. It most likely ate crocodiles and other smaller creatures to survive.
Similar in size and shape to today's sperm whale, this beast wasn't like the gentle giants we see now but rather a vicious predator that could open its jaw full of razor-sharp teeth wide enough to catch other, smaller whales and fish to devour.