Articles on Alien species

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Yellow crazy ants (Anoplolepis gracilipes), or Maldive ants, are among the world’s 100 most invasive species. Roman Prokhorov/iNaturalist

Biological invasions can cause severe animal suffering

Biological invasions can severely harm the welfare of animals, causing them to suffer. AWICIS is a new framework that can be used to assess the severity of these impacts.
On islands and in mountainous areas, goats introduced for breeding tend to proliferate, which is not without impact on ecosystems. Alessandro Carnevale/Shutterstock

How biological invasions are silently remodelling ecosystems

Invasive alien species don’t only drive out other native species, they also dramatically transform soils, water and ecosystems. A new assessment tool aims to pinpoint the negative environmental impacts.
Proteas growing outside Cape Town, South Africa. Johann Lourens/Getty Images

Cape Town’s wildflowers are a world treasure: six insights from a new checklist

The latest checklist of Table Mountain flora shows that Cape Town is still a global hotspot for threatened flowering plants.
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Do aliens exist? We asked five experts

Even if aliens exist, are intelligent like humans and interested in making contact with us, what are the chances they’ll be close enough for us to hear them screaming their presence into the cosmos?

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