Ray of hope for the red squirrel
Some red squirrels have developed immunity to a deadly disease carried by grey squirrels, scientists find.

Aquatic alien 'thugs' set to meet
Scientists believe the UK ranges of the plague-carrying non-native crayfish and voracious Chinese mitten crab are beginning to overlap.

Exotic spiders crawl into the UK
Exotic species of spider are setting up home in the UK, making the best of an increasingly mild climate.

Predators could be superweed fix
A plant-eating predator from Japan could be used to control a superweed spreading throughout the UK, scientists believe.

Alien invasion hits the UK
Invasive alien species in the UK are having a profound impact on ecology and the economy, scientists say.

Next generation
Meet 10 new aliens that could cause havoc in the UK

Bizarre visitors
Welcome to the weird world of waterway aliens

Garden invaders
Is there an alien growing in your garden?

Insect invaders
Meet the alien insects spreading throughout the UK

Your questions
Expert answers your alien invader questions