1. Of northern United States and Canada
   - spruce squirrel, red squirrel, Sciurus hudsonicus, Tamiasciurus hudsonicus

Type of: tree squirrel

• underglaze
• undergo
• undergrad
• undergraduate
• underground
• underground press
• Underground Railroad
• Underground Railway
• undergrow
• undergrowth
• underhand
• underhanded
• underhandedly
• underhung
• underivative
• underived
• underlay
• underlayment
• underlet
• underlie
• underline
• underling
• underlip
• underlying
• undermanned