Accidental introduction of the Asian chestnut blight fungus via the nursery trade virtually eliminated American chestnut from over 180 million acres of eastern United States forests in the first half of the 20th century. This extinction caused a whole scale transformation of the Eastern deciduous forest ecosystem, which was dominated by American chestnut. The loss of chestnuts was a disaster for many animals that were highly adapted to live in forests dominated by this tree species. For example, ten moth species that could live only on chestnut trees became extinct.

The predatory brown tree snake was introduced to Guam in cargo from the Admiralty Islands. Predation by brown tree snakes eliminated ten of the eleven native bird species endemic to the forests of Guam.

The Nile perch, a voracious predator, was introduced to Lake Victoria in Africa as a food fish. Predation from the Nile perch has eliminated over one hundred species of the spectacular native cichlid fishes of Lake Victoria.

Hybridization between Introduced mallards and the native Hawaiian may result in the extinction of the native species.

Hybridization between Introduced mallards and the native Hawaiian may result in the extinction of the native species.

Hybridization between the rarest European duck (the white-headed duck) and the invasive North American ruddy duck may result in the extinction of the native species.

This carnivourous snail was introduced as a biological control to fight the invasive species above. Instead it attacked and drove to extinction many native species like Partula.

This large African snail was imported to the island of Reunion in 1803 as a source of food. It has spread throughout the south Pacific and became a pest to agriculture.

Snails like Partula taeniata are native to Moorea in the south Pacific. Many species have been driven to extinction by the introduction of invasive species.

Kudzu, a native plant of Asia, was imported to America in 1876, and has spread widely.

South American sawgrass is an invasive species that has established itself on the west coast of North America.

A native to Australia, this Euclyptus, has been imported to Hawaii, North and South America, and Europe. It is used as a source of timber and fuel.