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Central American Dwarf Squirrel (Microsciurus alfari) · Western Dwarf Squirrel (Microsciurus mimulus) · Amazon Dwarf Squirrel (Microsciurus flaviventer) · Santander Dwarf Squirrel (Microsciurus santanderensis)

Subgenus Tenes: Caucasian Squirrel (Sciurus anomalus)
Subgenus Sciurus: Red Squirrel (Sciurus vulgaris) · Japanese Squirrel (Sciurus lis) · Eastern Gray Squirrel (Sciurus carolinensis) · Mexican Gray Squirrel (Sciurus aureogaster) · Collie's Squirrel (Sciurus colliaei) · Yucatan Squirrel (Sciurus yucatanensis) · Variegated Squirrel (Sciurus variegatoides) · Deppe's Squirrel (Sciurus deppei) · Fox Squirrel (Sciurus niger) · Peters's Squirrel (Sciurus oculatus) · Allen's Squirrel (Sciurus alleni) · Mexican Fox Squirrel (Sciurus nayaritensis) · Arizona Gray Squirrel (Sciurus arizonensis)
Subgenus Hesperosciurus: Western Gray Squirrel (Sciurus griseus)
Subgenus Otosciurus: Abert's Squirrel (Sciurus aberti)
Subgenus Guerlinguetus: Red-tailed Squirrel (Sciurus granatensis) · Richmond's Squirrel (Sciurus richmondi) · Brazilian Squirrel (Sciurus aestuans) · Yellow-throated Squirrel (Sciurus gilvigularis) · Bolivian Squirrel (Sciurus ignitus) · Atlantic Forest Squirrel (Sciurus ingrami) · Andean Squirrel (Sciurus pucheranii) · Guayaquil Squirrel (Sciurus stramineus) · Sanborn's Squirrel (Sciurus sanborni) · South Yungas Red Squirrel (Sciurus argentinius)
Subgenus Hadrosciurus: Fiery Squirrel (Sciurus flammifer) · Junín Red Squirrel (Sciurus pyrrhinus)
Subgenus Urosciurus: Northern Amazon Red Squirrel (Sciurus igniventris) · Southern Amazon Red Squirrel (Sciurus spadiceus)

Douglas Squirrel (Tamiasciurus douglasii) · American Red Squirrel (Tamiasciurus hudsonicus)