- red squirrel, cat squirrel, Sciurus vulgaris - common reddish-brown squirrel of Europe and parts of Asia
--1 is a kind of tree squirrel
--1 is a member of Sciurus, genus Sciurus - eastern gray squirrel, cat squirrel, Sciurus carolinensis - common medium-large squirrel of eastern North America; now introduced into England
--2 is a kind of tree squirrel
--2 is a member of Sciurus, genus Sciurus