The Momma snake that I hit last week needed no euthanizing. She was clearly expired, and there was no sign of life from the babies (at least three of them.)
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On the positive side, I've just confirmed that an adult is back living under the concrete stoop at the side of the house. "She" was out basking on a cinder-block next to the steps. She didn't let me get very close but she sure looked very dark with bright yellow stripes.

I ordered some pinkies to feed her and will get a flat tub to put water out for her.

I love having these snakes around They are so beautiful and fascinating.