Animals with no natural predators are called apex predators, because they sit at the top (or apex) of the food chain. The list is indefinite, but it includes lions, grizzly bears, crocodiles, giant constrictor snakes, wolves, sharks, electric eels, giant jellyfish, killer whales, polar bears, and arguably, humans.
Killer Whales
But the true ruler of the sea is the killer whale. Killer whales are apex predators, which means they have no natural predators.
Quokkas, famous for posing in selfies, are native to Rottnest Island where about 10,000 live a sheltered life free from predators or traffic. They are classified as a vulnerable species and have been almost completely wiped out on the mainland. Campbell isn't the first tourist to snap a selfie with a quokka.
Lions are the archetypal apex predator, but their hunting success rate strongly depends on the number of lions involved – a single lion hunting in daylight has a success rate of 17-19%, but this increases for those hunting as a group to 30%.
Elephants and rhinos usually do not have any predators that they flee from.
Given their tremendous size and strength, and because they gather in groups, elephants have few predators to worry about. Lions, hyenas, and crocodiles may attempt to prey on young or sick elephants.
In the unpredictable African wilderness, hippos face many perils, such as disease and drought. A full-grown adult doesn't have much in the way of natural predators. Lions have been known to take down hippos, but it depends upon how many lions, the age of the hippo, and how far it is from the water.
Megalodon was Earth's highest-level apex predator – ever.
The largest terrestrial mammalian carnivore and the largest known bear, as well as the largest known mammalian land predator of all time, was Arctotherium angustidens, the South American short-faced bear.
#1. Wolf. The wolf is the top apex predator in the world.
The mosquito is responsible for more deaths worldwide than wild animal attacks. The mosquito is the silent predator who strikes and leaves disease in its wake. For this reason alone the mosquito should make us all fearful for it gives no warning of it's oncoming bite.
The quokka, a small marsupial native to Australia, is one such example of a species vulnerable to extinction in the country's harsh surroundings. Known as the “happiest animal in the world” due to its cute and friendly appearance, these creatures are now only found in a few isolated forests and small islands.
For example insects, arachnids and crustaceans don't feel any type of emotion.
Rottnest Island is known worldwide to be the home of the happiest animal on Earth – the Quokka (Setonix brachyurus). Close relatives of Wallabies, these tiny animals are found all over Rottnest Island, where their survival is largely attributed to the exclusion of any natural predators.
1.Box jellyfish
Considered the most deadly creature in the sea, the box jellyfish may be beautiful to look at, but it has enough venom to kill a human in a matter of minutes. Native to Australia and found in Indo-Pacific waters, the box jellyfish has around 15 tentacles that can reach lengths of upto three meters.
“What eats me”
Lions have few predators to fear other than humans. A very young or sickly lion might fall prey to hyenas. Cubs may be attacked and eaten by adult male lions. Lions are most threatened by humans who hunt them and encroach on their habitat.
Dingoes are Australia's only native canid and play an important role as an apex predator, keeping natural systems in balance.
The Etruscan shrew has a body length of about 4 cm (1.6 in) excluding the tail. It is characterized by very rapid movements and a fast metabolism, eating about 1.5–2 times its own body weight per day.
Mosquitos are by far the deadliest creature in the world when it comes to annual human deaths, causing around one million deaths per year, compared to 100,000 deaths from snakes and 250 from lions. Perhaps surpringly, dogs are the third deadliest animal to humans.
According to the novel Alien vs. Predator: Prey, female Predators are considered just as fierce on their home planet as male ones are.
Predators. Leopards and crocodiles are large carnivores which may prey upon gorillas. Humans are the greatest threat to all gorilla populations.
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.
Elephants are afraid of bees. Let that sink in for a second. The largest animal on land is so terrified of a tiny insect that it will flap its ears, stir up dust and make noises when it hears the buzz of a beehive. Of course a bee's stinger can't penetrate the thick hide of an elephant.