When did grey squirrels start posing a threat to reds?

Selection:* Let's focus on the ecological impact of invasive species in the UK and the concept of using native predators (rewilding) to restore balance. * *Drafting context sentences:* The struggle between red and grey squirrels is a prominent example of the broader ecological challenges posed by invasive non-native species, which cost the UK economy billions of pounds annually. Beyond disease transmission