PAGE INDEX 1. Red & Grey compared 2. Red, lateral view 3. Grey, lateral view 4. Details of specimens illustrated.
|The skull of the Red Squirrel has a rounded, foreshortened appearance compared withthe Grey, and more elongated post-orbital processes. The species can be reliably separated by measurement. (see details section)|
Dental Formula : 220.127.116.11 / 18.104.22.168 (both species) The first upper premolar is rudimentary, and is absent in some squirrel species.
|1. Red (L) and Grey (R) Squirrels compared.|
|2. Red Squirrel, Sciurus vulgaris, lateral view|
|3. Grey Squirrel, Sciurus carolinensis, lateral view|
|Details of Specimens Illustrated|
|Condylobasal length||46mm||Zygomatic width||31mm|
|Jaw length||25mm||Interorbital width||16.5mm|
|Postorbital constriction||18mm||Nasal length||15mm|
|Condylobasal length||53mm||Zygomatic width||34mm|
|Jaw length||30mm||Interorbital width||17mm|
|Postorbital constriction||19mm||Nasal length||19mm|
Separating Red and Grey Squirrels by measurement :
Red Grey Condylobasal length < 50mm > 50mm Nasal length < 17mm > 17mm Ratio Nasal length / Post-orbital constriction ~ 0.85 ~ 1.0
Latin Names : Sciurus "a squirrel", but derived from the Greek wordsskia "shade" and oura "the tail".
vulgaris"common", carolinensis "of Carolina", referring to its American origins.