* Habitat and food: Grey squirrels are more adaptable and aggressive than red squirrels. They outcompete reds for food sources like nuts and seeds, and they also have a wider tolerance for different habitats. This gives them a competitive edge.
* Disease: Grey squirrels carry a deadly disease called squirrelpox, which can kill red squirrels. This further disadvantages the red squirrels.
* Impact on red squirrel populations: As grey squirrels outcompete and potentially kill red squirrels, the red squirrel populations decline. This is a significant issue for red squirrel conservation, as they are native to the UK and considered a threatened species.
It's important to understand that grey squirrels are not inherently malicious towards red squirrels. Their competition is primarily driven by their needs to survive and thrive, not by any deliberate attempt to harm the red squirrel population. However, the consequences of this competition are significant and have resulted in a dramatic decline in red squirrel numbers.