The Mute Swan, however, is quiet but fierce and males are extremely territorial during the breeding season. It's considered to be one of the most dangerous birds in the world. If you think male geese are bad enough, you don't want to know what it's like for male mute swans to beat them.
They prefer to feast on deer and boar, but will eat rabbits and mice if they can't find bigger game. Scientists sometimes call Amur leopards the “silent killer” since they're so good at sneaking up on prey.
Panda Bears
These fluffy black and white bears are one of the most adorable mammals. For the most part, pandas are pretty easy going and just eat bamboo most of the day, however, if they feel threatened they can be extremely dangerous. They can use their physical strength, strong jaws, and teeth to do a lot of damage.
The capybara considered the friendliest wild animal, has a calm and compassionate nature, even adopting stray and runt animals, and even providing transportation on its back for birds and monkeys. Considered worldwide as the best pets, canines were one of the first species domesticated by homo sapiens.
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.
Koalas. Koalas are not only extremely cute, they're smart, too! The marsupials know how to listen to their bodies and can dive into a deep sleep for an average of 22 hours a day. Koalas snack on eucalyptus leaves, which aren't high in nutrients—the abundant rest makes this diet possible.
Quokkas, famous for posing in selfies, are native to Rottnest Island where about 10,000 live a sheltered life free from predators or traffic.
Seahorses flirt a lot
Their courtship ritual consists of a lot of tail holding, nose touching, and colour changing. But it doesn't end once they've mated. They continue flirting daily through the incubation period until the eggs hatch!
Jaguars are the most silent animals, by far, as they're undetectable and no common animal can hear them in the wild. However, quiet animals like owls, which hide the sound of their wings flapping, and snakes have to be considered too.
Final Answer: Sloths are one of the only species in the animal kingdom that have no sounds at all. These creatures communicate using a series of gestures and motions with their bodies instead of sounds.
Chimpanzees are natural born killers, study says, and they prefer mob violence - The Washington Post.
The strongest land animal in the world is the elephant. The typical Asian elephant has 100,000 muscles and tendons arranged along the length of the trunk, enabling it to lift almost 800 pounds. The gorilla, the strongest as well as largest primate on the planet, is at least six times stronger than the average human.
The results show that the elephant wears the crown in the animal kingdom – but only slightly. Elephants had a win rate of 74%, just fractions of a percent ahead of their single-horned cousins – the rhinoceros – in second place, also on 74%. Not far behind in third place is the grizzly bear, at 73%.
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.
In the mid-2010s, quokkas earned a reputation on the internet as "the world's happiest animals" and symbols of positivity, as frontal photos of their faces make them appear to be smiling (they do not, in fact "smile" in the human sense; this can be attributed to their natural facial structures).
It's easy to see why the Quokka has been dubbed Australia's happiest animal - that gorgeous little smile! These heart melting creatures mainly reside on Rottnest Island, offshore from Perth, Western Australia.
Three-toed sloths are some of the slowest and seemingly laziest creatures in the world. Instead of evolving to eat more, they evolved to do less.
7. African Gray Parrots. African Gray Parrots are thought to be one of the most intelligent species on the planet, rivaling even apes. Some researchers have suggested that these parrots have a reasoning ability akin to a three- or four-year-old human child.
The honey badger has been called the world's most fearless animal because it doesn't hesitate to attack animals much larger than itself- even lions and crocodiles! Honey badgers are found in arid grasslands and savannahs and even rainforests. They live in burrows in the ground.
It is not for nothing that the honey badger has earned the reputation of being the most fearless animal in the world. Despite its small size, this carnivore is known for its ferocious defensive abilities and aggressive nature.
Bullfrogs… No rest for the Bullfrog. The bullfrog was chosen as an animal that doesn't sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting.