When ships sink, they add artificial structures to the seafloor that can quickly become diverse, ecologically important underwater communities.

Feral hogs are one of the most destructive invasive species in North America, harming land, crops and wildlife.

Non-native species tend to be better at exploiting the disturbance caused by storms, fires or droughts.

More than half of the world’s turtle species are endangered or threatened, and overhunting of wild species is a major cause.

Invasive Asian hornets are a top predator of bees in the UK – and sightings are starting to soar.

According to a new UN report, invasive species do more than US$423 billion in damage worldwide every year. Four articles explore examples, from mollusks to poisonous fish.

Modern ecosystems are very different to how they were just a few centuries ago.

Not all alien species are a significant hazard to people and ecosystems.

Plantations of exotic trees from the mid-19th century onwards devastated Indian ecosystems.