The red squirrel, also called Eurasian red squirrel, is a species of tree squirrel in the genus Sciurus. It is an arboreal and primarily herbivorous rodent and common throughout Eurasia.
Squirrel posing
S. v. fuscoater, a dark-furred subspecies, in Vienna
Tree squirrels are the members of the squirrel family commonly just referred to as "squirrels". They include more than 100 arboreal species native to all continents except Antarctica and Oceania.
Red squirrel
…The red squirrel (Sciurus vulgaris), also called Eurasian red squirrel, is a species of tree squirrel in the genus Sciurus. It is an arboreal and primarily herbivorous rodent and common throughout Eurasia. There have been over 40 described subspecies…
Eastern gray squirrel (Sciurus carolinensis)
Prevost's squirrel (Callosciurus prevostii)
Indian palm squirrel (Funambulus palmarum)
American red squirrel (Tamiasciurus hudsonicus)