This “living fossil” has survived in the South American Andes for millennia, but now faces an uncertain future due to climate change, fires, and voracious European animals.

As ecologists debate what to do about “invasive” swans in New York City, volunteers fight to keep them alive.

Scientists also declared several other extinctions, including the first documented plant extinction in New Hampshire.

Climate change, drought, and fires — all caused or worsened by human activity — are rewriting the future of ancient Sonoran saguaros.

The North American plants look pretty, but they also causes havoc in places where humans have allowed them to spread.

These unique ecosystems face threats from invasive species, development and pollution.

Ocean waters warmed by climate change could open the door for marine invasive species in one of the world’s most pristine ecosystems.

A misguided attempt to control mosquito populations has nearly driven this tiny fish to extinction.

The most remote inhabited island in French Polynesia is the habitat for several rare indigenous plants and animals, but it’s severely threatened by invasive introduced species.

Global shipping is moving invasive species around the world. Can world governments agree on necessary preventative measures?