Red squirrel vs grey squirrel: the field marks that actually separate them

You spot a squirrel in a tree. Is it a red or a grey? From the ground, at a distance, through foliage, the question is harder than it sounds. Both species have the same compact body, the same prominent bushy tail, the same habit of freezing and watching you back. Getting it right takes knowing which marks to check and in which order.

The one-second check: ear tufts

From autumn to early spring, the red squirrel grows long, prominent ear tufts that extend visibly above the tips of the ears. They are dark, sometimes almost black, and obvious from several metres. A grey squirrel has no ear tufts. At any time of year. None. That is the fastest single field mark and, in winter, essentially decisive.

The catch: red squirrel ear tufts moult in summer and by July are almost gone. A July red squirrel without tufts looks more like a grey than you would expect, which is when colour and size become important.

Colour: less clear-cut than you would think

Red squirrels range in coat colour from bright chestnut orange to a distinctly grey-brown, especially in summer. Some individuals look almost grey. Grey squirrels are silver-grey with a brownish tinge down the centre of the back and a cream-white belly. In bright light the grey sheen is obvious. In shade, a grey-phase red can create genuine uncertainty.

The reliable colour clue is the tail. A red squirrel's tail is full, bushy and matches the body colour, often with pale cream fringing. A grey squirrel's tail is broader, flatter and silvered at the tips, giving it a halo effect at the edges. In a clear view, that tail shape is confirmatory.

Size and build

Put them side by side and the difference is obvious. A grey squirrel is noticeably larger: around 25 cm body length and up to 600 g, compared to the red's 22 cm and approximately 300 g. The grey is stockier with a heavier head. The red is slimmer with a slightly smaller face and more pointed features.

When you see one alone, with no reference, size judgment is hard. Use it to support other marks, not as a primary ID.

Where each species lives

In the UK, red squirrels now hold territory in Scotland, small pockets of northern England (Northumberland, the Lake District, Formby Point), Brownsea Island in Dorset, the Isle of Wight and Anglesey. If you are in southern England and see a squirrel in a garden or park, it is almost certainly a grey.

Across continental Europe, red squirrels are more widespread, present across Scandinavia, central Europe and into Siberia wherever conifer and mixed forest exists. In these regions a squirrel sighting cannot be defaulted to grey.

Grey squirrels were introduced to Britain from North America in 1876. They are now the dominant squirrel across England, Wales and lowland Scotland.

Behaviour and diet: where they differ

Both species cache food. Both navigate back to their stores by memory and smell. Both are active by day and retreat to a drey, a ball-shaped nest of sticks and leaves, to sleep.

The key dietary difference: red squirrels are specialists for conifer seeds. They can extract seeds from pine and spruce cones efficiently and thrive in the kind of continuous conifer canopy that grey squirrels find less productive. Grey squirrels are generalists. They handle unripe broadleaf seeds, particularly acorns and hazelnuts, better than reds, and outcompete them in broadleaf woodland.

Grey squirrels also carry a poxvirus that is harmless to them but lethal to red squirrels. Where greys establish in woodland that reds occupy, reds are typically absent within a few years. It is one of the most-studied cases of competitive exclusion in European wildlife.

How rare is the red squirrel to spot?

In the Kaught catalog the red squirrel is Epic, three diamonds out of four. That reflects the reality of sighting frequency: in most of England, Wales and urban Scotland, a red squirrel sighting requires a dedicated trip to a managed reserve or known stronghold. There is no casual road-edge encounter, no garden visit. You have to go looking, in the right place.

The grey squirrel, common in parks, gardens and woodland across most of Britain, is not in the Kaught catalog. It is part of the background, the context against which the rarity of the red stands out.

If you are in a conifer forest in northern Scotland in autumn and see a squirrel with ear tufts, that is one of the more straightforward Epic-rarity records in the catalog. It earns the three diamonds. See also: other woodland species you can spot at dusk, including animals that share the red squirrel's forest habitat.