House cats are often invasive predators that damage the ecosystems they are introduced into.

Around the world, invasive species are a major threat to many coastal ecosystems and the benefits they provide, from food to clean water.

The invasive reed Phragmites has been steadily overtaking a marsh scientists are studying.

Around the world, invasive species are a major threat to many coastal ecosystems and the benefits they provide, from food to clean water. Attitudes among scientists are evolving, however, as more research demonstrates that they occasionally carry a hidden upside.

An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.

The morning glory is an invasive plant that climbs over everything.

But the invasive European green crab pushes native crabs out of their burrows. Under pressure from the invader, native crabs are eating less marsh grass. Marshes are recovering, and their carbon storage capacity is growing with them.

Invasive species are animals or plants from another region of the world that don’t belong in their new environment.

Sami's stepdad didn't want to be too invasive.

Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources.