What is a rescue snake?
I rescued him from a cold swimming pool. The small (very clean) garter snake rewarded me by A: not biting, and B: hanging out on a rock in the warm sun for a few minutes while I captured him again, this time photographically. Note that keeping the snake in the plane of sharp focus at f/2 was challenging, requiring careful orientation of the camera.
The Canon RF 85mm F2 Macro IS STM Lens, with its close-focusing capabilities, is a great choice for walking around the garden (or nearly anywhere) with.