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What's the smartest defense strategy for a smart animal?

Statistically, 80% of the world's population has body odor, and thankfully, in China, only 20% of the population emits body odor. Many people are very distressed by this, suffering from low self-esteem, embarrassment, and even searching for ways to solve the problem, because for human beings, a particular odor can be a minus.

In the animal kingdom, however, many animals have evolved smarter mechanisms, and being "smelly" has become a plus for them. It's by taking advantage of the "stench that everyone wants to avoid" that they've created their own defenses that are more effective than camouflage.

1. Vultures, the vomit attack

Vultures are scavengers that are beneficial to nature by removing animal carcasses and bacteria that may be carried in nature.

Vultures are not at all cute looking, and with their love of carrion, they can look a bit scary.

However, their defense mechanisms are even more horrifying than their appearance, and even harder to accept.

Scientists have described how a food party with a group of vultures can easily turn into a nasty "slobbering" battle, with most predators being scared off by vomiting when they feel threatened.

This is an effective mechanism, as the vultures, whose vomit includes carrion, saliva and bile from their stomachs, attack each other's eyes and faces with the foul-smelling objects, causing a stinging sensation that ultimately sends the predators scurrying away.

2, possum, playing dead session of the "Oscar"

Possum, is a primitive marsupial mammals, it's unique skill is to play dead.

To fake the illusion that they're already gone, these little guys lie around with their tongues hanging out, sometimes for hours at a time, just to convince the predator in front of them that they're perfectly capable of finding fresher food elsewhere.

Some predators are so patient that they will keep attacking it, at which point the possum is also very persistent, remaining motionless until the threat is removed in order to achieve its goal.

And in this series of "performances," its scent plays an important role.

When it fakes its own death, the opossum expels a "stinky green slime" that emits a foul odor that reinforces to predators that it is no longer a fresh corpse.

3. The Musk Pheasant, Vegetarian or Stinky National Bird

The Musk Pheasant, a tropical bird, is found in the Amazon and Orinoco River deltas of South America.

The word "musk" is in the name because the bird emits an odor that smells like fresh cow dung, hence the names "stinky bird" and "stinky Anna".

Named for its digestive system, the stinkbird is the only bird in the world that is almost entirely vegetarian, feeding on leaves, which enter the crop and are fermented and broken down by ****-producing bacteria before being digested and absorbed into the gut, a behavior similar to that of a ruminant herbivore.

Their foul odor is due to the aromatic compounds in the leaves they eat, combined with fermentation.

It's also the stink that keeps them from being at risk of extinction and has been elected Guyana's national bird.

4. The millipede, which secretes toxic chemicals

The millipede, also known as the marabou, is easily misunderstood.

Despite the worm in their name, in reality they are arthropods, more closely related to crabs and spiders;

They are also deceptively named, with only about 750 legs instead of the 1,000 in their name;

Sometimes they are portrayed in horror movies, but in reality they are leaf-eaters and don't bite.

Millipedes have many natural predators, including lizards, birds and insects, and one of their common defenses is that they curl up into a ball, sometimes releasing a noxious defensive spray that irritates the skin, hurts the eyes, and leaves a horrible odor on their attackers.

According to statistics, millipedes have about 30 different chemical secretions, including cyanide, benzoquinone and other toxic substances, depending entirely on which species you encounter.

Scientists believe that these defense secretions are specifically for the critters, and that if a bird picks them up, they are so enraged by the release of the secretions that the bird has to put them down again.

Some scientists have also been bold enough to offer themselves up to try the secretions for themselves - just one lick, to be precise - with terrible results, a pungent, burning flavor.

5. Sea hare, which can disable opponents' noses

Sea hares aren't rabbits, they're sea slugs that live in the ocean and are showy and elegant, but they're also poisonous, and therefore not the most popular dish in the marine food chain.

Nevertheless, this sea slug has a rather ingenious and odor-related defense mechanism, the opposite of almost all of the above.

The sea hare has two types of glands, one that secretes a purplish-red fluid that stains the surrounding water purple and then uses this chaos to escape, and one that secretes a milky-white substance, a species that smells so bad that it instantly dissuades a predator from eating the sea hare.

A 2012 study found that milky proteins in the sea hare's secretions block the lobster's chemoreceptors, causing it to be unable to smell potential food and exhibit anxious behaviors, such as flicking its tail and rubbing its mouth.

That is, the sea hare gives its rivals the equivalent of a stuffy nose, causing them to instead be unaware of how bad the odor is.