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agkistrodon-contortrix
agkistrodon-piscivorus
coluber-constrictor
crotalus-atrox
crotalus-horridus
crotalus-ruber
crotalus-scutulatus
crotalus-viridis
diadophis-punctatus
haldea-striatula
heterodon-platirhinos
lampropeltis-californiae
lampropeltis-triangulum
masticophis-flagellum
natrix-natrix
nerodia-erythrogaster
nerodia-fasciata
nerodia-rhombifer
nerodia-sipedon
opheodrys-aestivus
pantherophis-alleghaniensis
pantherophis-emoryi
pantherophis-guttatus
pantherophis-obsoletus
pantherophis-spiloides
pantherophis-vulpinus
pituophis-catenifer
rhinocheilus-lecontei
storeria-dekayi
storeria-occipitomaculata
thamnophis-elegans
thamnophis-marcianus
thamnophis-proximus
thamnophis-radix
thamnophis-sirtalis