found: Work cat: Recovery strategy for the Butler's gartersnake (Thamnophis butleri) in Canada, 2018.
found: NatureServe Explorer website, April 6, 2020:(Thamnophis butleri, Butler's Gartersnake; Other common name - Butler's Garter Snake; Genus - Thamnophis, Family - Colubridae, Order - Squamata, Class - Reptilia, Phylum - Craniata, Kingdom - Animalia)
found: ITIS website, April 6, 2020:(Thamnophis butleri; Synonym - Eutaenia butleri; Common name - Butler's Garter Snake; Genus - Thamnophis, Family - Colubridae, Order - Squamata, Class - Reptilia, Phylum - Chordata, Kingdom - Animalia)
found: Reptiles database website, April 6, 2020:(Thamnophis butleri; Higher taxa - Colubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes); Common name - Butler's Garter Snake; Synonym - Eutaenia butleri)
found: IUCN Red List of Threatened Species website, April 6, 2020:(Thamnophis butleri; Genus - Thamnophis, Family - Natricidae, Order - Squamata, Class - Reptilia, Phylum - Chordata, Kingdom - Animalia)
