Just got back from a mini vacation to Kitsap County, WA. While there, I four T sirtalis pickeringii - Two DOR (not photographed) and two very much alive:

Specimen 1 - I'm thinking this was an old snake, it was very lethargic and looked emaciated despite there being plenty of available prey:

Puget Sound Garter Snake (Thamnophis sirtalis pickeringii)





Specimen 2 - in much better health:

Puget Sound Garter Snake (Thamnophis sirtalis pickeringii)



This is likely part of their diet - Rana aurora




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The Puget Sound Garters may have some Red-spotted influence.
The "classic" Puget Sound Garter is a dark snake with a thin dorsal stripe and lateral stripes that often appear blueish - with a row of barely visible double cream or blue dots just above the lateral stripe on each side. In these specimens, those rows of lateral dots were red.