Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada

Sebastian Kennerknecht / San Francisco Garter Snake (Thamnophis sirtalis tetrataenia) on pond vegetation, Pescadero, California

Tim Fitzharris / Common Garter Snake (Thamnophis sirtalis) with extended tongue, very common snake, North America

David Perpinan / Necrosis / tissue dying in hemipenis of captive garter snake (Thamnophis sirtalis) small repro only

John Cancalosi / Common ribbon snake (Thamnophis sauritus sauritus) Virginia, USA. October.

John Cancalosi / Common ribbon snake (Thamnophis sauritus sauritus) Virginia, USA. October.

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) outside hibernation dens. Narcisse snake dens, Manitoba, Canada. The dens are home to over 50,000 garter snakes, making it the greatest concentr...

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) outside their hibernation dens. Narcisse snake dens, Manitoba, Canada. The dens are home to over 50,000 garter snakes, making it the greatest co...

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) following their emergence from hibernation. Narcisse snake dens, Manitoba, Canada. The dens are home to over 50,000 garter snakes making it the...

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) following their emergence from hibernation, Narcisse snake dens, Manitoba, Canada. These are mostly males who mass outside the dens waiting for...

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) outside their hibernation dens, Narcisse snake dens, Manitoba, Canada. These are males on the lookout for females. The dens are home to over 50,...

Huw Cordey / Red-side garter snakes (Thamnophis sirtalis parietalis) outside hibernation dens, Narcisse snake dens, Manitoba, Canada. The snake in the foreground is a female . She is surrounded by the smaller male...