Mice make garters bigger then on worms?

[BChambers]

I was talking about sirtalis sirtalis,but dont really know about other species.

It makes sense to me that your Quebec sirtalis may well find UV light very beneficial, while my marcianus do fine without it. Canadian sirtalis-indeed, all northern forms of Thamnophis, are primarily diurnal. They are adapted to lots of solar exposure due to the cold nights you experience, even in midsummer. Down here in Texas-and other hot, dry habitats- our garters don't dare show their faces when ol' sol is above the horizon! Most foraging, breeding etc is done at night.

Again, these things are easier to figure out if we look at how our snakes are living in a natural state.