Garter snakes are in the genus 'Thamnophis'. The common garter snake is 'Thamnophis sirtalis'
There's no such species as a 'garden snake' - it's a GARTER snake ! (Genus -Thamnophis)
An example of a genus is "Canis", which includes species such as wolves, coyotes, and domestic dogs.
You have it right in your question, the genus is Thamnophis, and the species is sirtalis. The common name is the garter snake.
If by 'garden snake' you meant Garter Snake (Genus Thamnophis) - then yes. Worms are part of their natural diet.
a garter snake.
The garter snake is close to the water snake
One is a Garter Snake and one is a rattle snake.
The Garter snake weighs 18-20lbs
No
Garter snake eggs are soft shelled.
Two-striped Garter Snake was created in 1860.