A fully grown saltwater crocodile would win a fight against the largest bears. Size matters in these fights and crocodiles have that advantage. Bears are undoubtedly strong, but they've never faced anything like a crocodile to know their weaknesses.
A hippo would win a fight against a crocodile. Although crocodiles are large, powerful creatures, they cannot kill a fully grown hippo. Hippos are large, roundish animals that are much taller than crocodiles. The only place they would be vulnerable to attack is their legs.
Although the alligator has a very powerful bite, it cannot match the grizzly bear for sheer power. The best-case scenario for the alligator is that it ambushes the grizzly bear on land.
Forceful Hunter: Tigers
A tiger's bite can exert approximately 1,000 pounds of force per square inch. The tiger is one of the largest carnivores in the world, eclipsed only by the polar and grizzly bears. The most intimidating species, the Siberian tiger, can potentially weigh up to 800 pounds.
Although a silverback gorilla is very fast, quite strong, and has a longer arm span, it is unlikely that a silverback could defeat the much larger and faster grizzly bear in a fair fight. The one advantage that a Silverback might have is in the enormous strength of its muscles.
Too Weak to Support Its Own Body Weight: The Jellyfish
Crystal jellies Aequorea victoria, are a bioluminescent hydrozoan jellyfish, or hydromedusa, that is found off the west coast of North America. Almost every living creature on the planet has at least the strength to support its own body and move around.
A crocodile would win a fight against a gorilla. Most of the fights would begin in or near water, and a gorilla doesn't stand a chance in that scenario. If a crocodile bit and dragged the gorilla into the water, then it's a simple victory.
Since the hippo is taller than the saltwater crocodile, it could pick it up with its teeth, bite, stomp and fling the crocodile. A few repeats of this, and the crocodile is already dead. While the crocodile can launch a surprise attack in the water, the hippo will likely win in a fight.
A crocodile would win a fight against a Komodo dragon. Crocodiles are simply too large and too powerful for a Komodo dragon to fight back against. One likely outcome would be the crocodile waiting for the Komodo dragon in water and dragging it beneath the waves to suffer a brutal death.
A hippo would win a fight against a polar bear.
Instead, the hippo needs one or two bites to incapacitate the polar bear. Its massive teeth would penetrate the bear's fur and skin, breaking bones and ripping into organs. In this rare case, speed on land would only matter at the beginning of the fight.
A bear would win a fight against a lion. Bears have the advantage in just about every aspect, from size to offensive capabilities. The only time that a lion would win is if it managed to sneak up and ambush a bear, leaping onto it and biting into its head with such power that it shattered the skill.
Nile crocodiles have the size advantage over grizzly bears. The largest Nile crocodile is larger than a grizzly bear. The average grizzly bear weighs 400 to 700 pounds, but it can reach over 1,000 pounds. Still, that is less than half of what the largest Nile crocodile weighed at 2,300 to 2,400 lbs.
But despite their size and strength, there are animals that do prey on them. Man appears to be their biggest predator. Big cats like leopards and panthers sometimes kill and eat these big reptiles. Large snakes can also do a lot of damage to alligators and crocodiles.
"If they've got hold of you, poking the eyes is the only possible way you can fight back - they have thousands of years of instinct telling them this is the only vulnerable part of their body and they need to let go," Mr Cooper says.
If the fight were to happen on land, a rhino might have the upper hand against a saltwater croc because it is more used to living on land. However, if a fight started close to the water or in the water directly, the crocodile would likely defeat the rhino.
A fully grown crocodile would win a fight against a jaguar every time. The reason is simple: jaguars couldn't muster enough power to land a fatal attack on a grown crocodile without putting themselves at tremendous risk. Jaguars prefer to hunt their prey and land a quick, fatal attack on the throat.
The biggest determining factor in a fight between a rhino and hippo would be whether the fight was in the water or on land. A fight on the land could end with a rhino charging at 30mph with its horn and strong neck muscles thrusting into the side of hippo, knocking him over, and using his horn to finish the hippo off.
Saltwater crocodiles are longer than most anacondas and heavier, too! An anaconda is a snake while a crocodile is closer in morphology to a lizard, even though they are not directly related to them. Crocodiles are heavier and faster than anacondas both on land and in the water.
If a hungry tiger decides to attack an alligator on land, the alligator would have no chance.
A gorilla would win a fight against a kangaroo.
The gorilla has the weight and power to overwhelm the lighter creature completely. It would use all its weight and power to topple the kangaroo in a bout of extreme violence.
To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle.
Why tardigrades are so damn tough. It's important to note: Tardigrades are basically indestructible only when they enter a special state called cryptobiosis. In harsh environments, the animals tuck in their legs and expel all moisture from their bodies. In this state, they're called tuns.
According to the Independent, honey badgers have been described in the Guinness Book of Records as the "most fearless animal in the world" and can even fight off much larger predators like lions and hyenas.