Cholera, bubonic plague, smallpox, and influenza are some of the most brutal killers in human history. And outbreaks of these diseases across international borders, are properly defined as pandemic, especially smallpox, which throughout history, has killed between 300-500 million people in its 12,000 year existence.
Cardiovascular disease is the top cause of death globally. In the map we see death rates from cardiovascular diseases across the world.
This first table gives a convenient overview of the general categories and broad causes. The leading cause is cardiovascular disease at 31.59% of all deaths.
Table ranking "History's Most Deadly Events": Influenza pandemic (1918-19) 20-40 million deaths; black death/plague (1348-50), 20-25 million deaths, AIDS pandemic (through 2000) 21.8 million deaths, World War II (1937-45), 15.9 million deaths, and World War I (1914-18) 9.2 million deaths.
Nazi Germany, as part of a deliberate program of extermination, systematically killed over 11 million people including 6 million Jews. In addition to Nazi concentration camps, the Soviet gulags (labor camps) led to the deaths of 3.6 million civilians.
Four species of sharks account for the vast majority of fatal attacks on humans: the bull shark, tiger shark, oceanic whitetip shark and the great white shark.
Man's best friend is actually one of the world's deadliest mammals. Worldwide, dogs are responsible for about 25,000 human deaths from rabies each year resulting from maulings and bites.
The 'immortal' jellyfish, Turritopsis dohrnii
To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii.
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.
Synanceia verrucosa, a species of stonefish, is lined with dorsal spines that deliver an intensely painful and lethal venom. It is sometimes called the most venomous fish in the world.
Said to be one of the most dangerous animals in Australia, the Saltwater Crocodile is an aggressive and territorial animal, and is the largest reptile in the world in terms of their mass – known to reach over 1000kg!
Australia is home to some of the deadliest creatures on Earth. From snakes to spiders and scary sea creatures, this continent has it all. The inland taipan, for example, is known as the world's most venomous snake.
If a fight occurred between a hippo and a gorilla it is obvious that a hippo severely outmatches even the largest of gorillas and strongest gorillas. In a fight, a hippo can easily kill a gorilla by either charging through them or using its large mouth to take them out.
So, it's best to just observe these formidable animals in their natural habitats from a safe distance. The polar bear would win a fight vs. a silverback gorilla, having a size, speed, and strength advantage.
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, round animals that are much taller than crocodiles. The only place they would be vulnerable to attack is their legs.
Dogs are also pack animals and long to belong to a pack. They are much like humans in that way – it is said that no man is an island and the same can be said for a dog. To your loyal dog, your family is their pack and they have adopted you as their own. Loyalty in a pack is crucial.
CHIMPANZEES. RECKONED to be the most-intelligent animals on the planet, chimps can manipulate the environment and their surroundings to help themselves and their community. They can work out how to use things as tools to get things done faster, and they have outsmarted people many a time.
It's our feline friends that are the cutest pets of them all, according to science. With cats coming out as the animals with the most adorable faces, followed by ferrets, rabbits and hamsters.