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They impact native ants and other insects, damage crops, and their painful stings can pose health threats to humans and livestock.

This predatory fish has caused the extinction or decline of several hundred native fish species in Lake Victoria.

They compete with native species for food and habitat, spread diseases, and their toxic skin kills predators.

It outcompetes native plants, disrupts riparian zones, and can cause damage to property with its strong roots.

They outcompete native red squirrels for food and habitat, and can cause significant damage to forests and wildlife.

They outcompete native bird species for nesting sites, leading to declines in native bird populations.

This large snake preys on a wide range of native species, often leading to declines in mammal populations in areas where it becomes established.

Overgrazing by this species leads to soil erosion, loss of native vegetation, and impacts on native fauna.

Outcompetes native fish for food, altering the aquatic food web and potentially leading to the collapse of native fish species.

They clog water intake pipes, damage boats, and outcompete native mussels, leading to significant economic and ecological costs.

It infests and kills ash trees, leading to the loss of millions of trees and severe impacts on ecosystems, municipalities, and industries.

Predation by this snake has led to the severe decline or extinction of several bird species on Guam.

Forms dense mats which block waterways, affect water flow, reduce oxygen levels, and negatively impact aquatic organisms.

Lionfish predate on and compete with native fish, causing declines in reef fish populations and negative impacts on coral reef ecosystems.

This predatory fish impacts native species by predation and competition for resources, leading to ecological imbalance.

It preys on a variety of organisms, altering food webs, and competes with native crabs and fish for food and habitat.

Disrupts native ant populations, affects the balance of ecosystems, and can cause declines in small vertebrate populations.

This plant grows rapidly, smothering native plants and trees under a blanket of leaves, leading to reduced biodiversity.

Displaces native wetland plants, reduces biodiversity, alters hydrology, and negatively impacts wetland ecosystems.