The trade in caged birds poses a risk to native species if the pets escape into the wild, UK researchers say. They identified almost 1,000 species of bird introduced into new areas by human activity ...

A Polish scientific institute has classified domestic cats as an "invasive alien species", citing the damage they cause to birds and other wildlife. Some cat lovers have reacted emotionally to this ...

Alison Steadman tells the story of why and how so many birds that make up the avifauna of Britain are aliens from elsewhere. Programme one: pheasant. Producer: Tim Dee ...

An alien bird species has landed in large parts of northern Italy, putting local wildlife at risk. The African sacred ibis is an invasive species that is thought to have invaded after it escaped or ...