10 Most Invasive Creatures On Earth

10. Cats

Believe it or not, the domesticated cat, which can be traced back three thousand years to the eastern Mediterranean, is one of the most invasive creatures on Earth. Considering the extent to which cats are valued as pets,
it is not surprising that they have since been translocated by humans to almost all parts of the world. Notable predators, cats threaten native birdlife and other fauna, especially on islands where native species have evolved in relative isolation from predators.

9. Starlings
Don’t be fooled by this bird’s striking colors. The European starling is a notorious competitor and will aggressively lay claim to native bird nesting sites, kicking out the resident birds and their eggs. They compete with native birds for space and food, but also carry disease, ticks, and mites that are spread to native bird species and humans. Starlings are also a threat to farmers since flocks of birds can wipe out crops.
8. Killer Bees
Even though movies such as the 1974 film Killer Bees have succeeded in instilling fear, the bees’ venom is no more toxic than that of the European honeybee. They are, however, known to be highly aggressive and sting a lot more, with some victims receiving more than a thousand stings. In addition to being a threat to humans, they are also relatively lazy when it comes to producing honey, making them a threat to agricultural stability as well.
7. The Gray Squirrel
The gray squirrel may be cute and fuzzy to look at, especially in Stanley Park in Vancouver, but it is an invasive mammal in British Columbia that is ranked by the Invasive Species Specialist Group (ISSG) as one of the Top 100 Invasive Species in the world. This small mammal has big ecological impact, often causing disease (parapoxvirus), and is responsible for displacing native birds from their nesting habitat, and eating the birds’ eggs and nestlings.

6. Zebra Mussels
Zebra mussels are small, fingernail-sized creatures that attach to solid surfaces in water. A single female can produce 100,000 to 500,000 eggs per year, contributing to their successful invasions. These develop into microscopic, free-living larvae that begin to form shells, taking over huge lakes.
5. The Snakehead Fish
The northern snakehead, as it is also known, is a type of snakehead fish native to China, Russia, North Korea, and South Korea. In Europe, the first report of the species was from Czechoslovakia (the Czech Republic) in 1956. In the United States, the fish is considered to be a highly invasive species, which has led to major media coverage and two horror films.
4. The Cotton Whitefly
The cotton whitefly has been reported on all continents except Antarctica. It is believed the cotton whitefly has spread throughout the world through the transport of plant products that were infested with them. Once established, it quickly spreads and through its feeding habits and the transmission of diseases, it causes destruction to crops everywhere.
3. The European Rabbit
The feral European rabbit is one of the most widely distributed and abundant mammals in Australia. It causes severe damage to the natural environment and to agriculture. European rabbit control is complicated because of welfare and harvesting issues, and because both native and introduced predators feed on feral rabbits in many parts of Australia. An invader and victim at the same time? Pretty much.

2. The Cane Toad
Cane toads were introduced to many countries as biological control agents for various insect pests on sugarcane and other crops. The cane toads have proved to be pests themselves. They will feed on almost any terrestrial animal and compete with native amphibians for food and breeding habitats. Their toxic secretions are known to cause illness and death in domestic animals that come in contact with them, such as dogs and cats, and wildlife such as snakes and lizards.
1. Japanese Starfish
Originally found in far north Pacific waters and areas surrounding Japan, Russia, North China, and Korea, the northern Pacific sea star has successfully invaded the southern coasts of Australia and has the potential to move as far north as Sydney. The sea star will eat a wide range of prey and has the potential for ecological and economic harm wherever it finds itself.
10 Most Invasive Creatures On Earth 10 Most Invasive Creatures On Earth Reviewed by 1 on May 06, 2018 Rating: 5
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