garter snake thamnophis atratus zaxanthus basking in the sun on a hot day, san francisco bay, california

america area atratus basking bay blooded bright california cold colorful dangerous day endemic francisco free friendly garden gardener garter gartersnake grass gravel gray grey ground hot lawn looking lounging meadow native not orange outdoors park pasture reptile ribbon san scales shiny snake states sun sunning thamnophis tiny united warming west wild wildlife yellow zaxanthus