The number of alien plant species has more than tripled over the last 25 years. This is the finding of a study by European scientists who evaluated the data from 48 European countries and regions. A ...

Add Yahoo as a preferred source to see more of our stories on Google. A lot of people think of plants as pretty to look at, but defenceless and passive as far as organisms go. However, the many alien ...

Many mountain ranges contain semi-natural habitats experiencing little human interference. They are home to many animal and plant species, some of them endemic and highly specialized. Mountains have ...