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Rats - These rodents are incredibly adaptive and can cause problems for vegetation, human health, and various types of birds and small animals.

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Rats - They carry viruses and bacteria that harm other species.

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Rats - When they travel in groups, they can be even more destructive.

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Asian giant hornets - This giant species of wasp kills around 40 people a year and can fly up to speeds of 36 km/h.

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Asian giant hornets - They are common in Japan, where around 500 different species exist. The wasp relentlessly hunts other large insects, like bees, other wasps, and praying mantes.

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Western honey bee - When they are alone, they are harmless, but if a person gets caught in a swarm of bees, they can transfer enough venom through their stinger to cause renal failure, acute anemia, and death.

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Africanized bee - This species aggressively spread throughout South America, harming the toucan and macaw populations as well as the natural habitat. It is a threat to humans and pets as its sting is lethal.

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Atta - This ant species has destroyed many ecosystems, especially in Brazil, where it is an agricultural pest.

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Atta - In large numbers they can destroy trees, including eucalyptus and pine. They cut pieces of leaves and carry them back to their colony in order to grow a fungus that they then eat.

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Poison dart frog - This frog species is found in South American. Its venom is lethal and can kill up to 20 adults.

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Poison dart frog - The lightest touch covers the victim in venom. It is best to appreciate their beauty from afar.

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Mosquitos - There are many species of mosquito that can transmit diseases to humans.

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Mosquitos - They can spread yellow fever, malaria, dengue, and other diseases. On average, mosquitos cause the death of three million people a year.

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Wild boar - This species exists in Europe, North America, and North Africa. The animal caused many problems to the ecosystem when it was introduced to South America.

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Wild boar - Boars transmit diseases that can harm agriculture.

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European rabbit - This invasive species is native to the Iberian peninsula but spread throughout the world, causing environmental and overpopulation problems.

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European rabbit - Its preferred habitats are temperate forests and open spaces, like prairies and farmland.

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Jellyfish - It's said that this is the most dangerous and venomous creature in the world. The marine animal inhabits the waters around Australia and Asia and it can kill people on contact.

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Jellyfish - The animal's venom can spread through the body and reach the heart, nervous system, and skin cells while causing pain capable of paralyzing its victim.

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Common starling - This bird is native to Eurasia but it was introduced to North American, South Africa, Australia, and New Zealand.

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Common starling - The starling is a pest to the ecosystem, specifically on the American continent, where it causes significant agricultural damage.

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Burmese python - These snakes can reach 6 m in length and are a risk to North American ecosystems.

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Burmese python - It is estimated that in the state of Florida, there are currently 150,000 pythons living freely in the woodlands. It can harm ecosystems as it feeds on other animals.

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Giant African snail - They make their home in various parts of the world, but mainly in Africa.

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Giant African snail - This snail can transmit a type of worm, called Angiostrongylus cantonensis, that causes meningitis. This type of meningitis has been recorded mostly in Asia, but there have also cases in Cuba, Puerto Rico, and the United States.

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Southern blue-ringed octopus - This animal, found in Australia and Japan, is known for its beautiful coloring.

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Southern blue-ringed octopus - It is so toxic that it can kill up to 26 adults in minutes. It produces two types of venom: one to hunt down victims and another to weaken them.

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Platypus - This aquatic mammal is native to Tasmania and Australia. Its bill contains venom, but only the males bite.

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Platypus - Although they cannot kill humans, they can kill other animals, including dogs. If a person is bit by the animal, they will feel intense, unbearable pain.

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Armed spiders - This spider comes from South America and is the most dangerous and venomous of its species.

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Armed spiders - They are incredibly aggressive and just 6 mg of their venom can kill a rat.

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Pigeon - This animal invades cities and can be found living in harmony with humans. However, they are a host for many different parasites, including lice and mites.

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Pigeon - In many countries, they are considered a serious environmental problem as they compete for food with native species, ruin monuments with their feces, and can transmit more than 50 different types of diseases to humans.

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