The main differences between grey and red squirrels are:
1. Appearance: Grey squirrels have grey fur with white underbellies, while red squirrels have reddish-brown fur with white underbellies.
2. Size: Grey squirrels are larger than red squirrels. Grey squirrels can weigh up to 1.3 pounds, while red squirrels weigh around 0.5 pounds.
3. Distribution: Grey squirrels are found in North America and Europe, while red squirrels are found in Europe and northern Asia.
4. Habitat: Grey squirrels prefer wooded areas, while red squirrels prefer coniferous forests.
5. Adaptation: Grey squirrels are better adapted to urban and suburban environments, while red squirrels are better adapted to natural environments.
6. Behavior: Grey squirrels are more aggressive than red squirrels, and they have been known to displace red squirrels from their habitats. Red squirrels are more solitary and tend to be less aggressive towards other squirrels.
7. Food: Grey squirrels have a wider range of food options, including nuts, seeds, berries, and insects, while red squirrels mainly feed on tree seeds and fungi.