From commentor Bella:
I boarded my horse at a county park in CA, which became a dumping ground for unwanted cats and dogs. A couple of us joined forces and started trapping cats, fixing them, and getting the tame ones to an adoption group. We got over 120 cats and a handful of dogs out of the park (and fed the rest.) A man who walked his dog there knew that I did this, and flagged me down one cold Sunday morning to let me know he’d found a tiny kitten crying by the gate. I had no trouble finding the little tabby, 3 weeks old at most, because it was not so much crying as shrieking. My guess is mama was moving the litter and was late coming back for this one.
I put her in my car and ran into Walmart to get some kitten milk and a syringe to try to feed her, which mostly resulted in milk all over the kitten, as she never did stop wailing. I called our rescue lady and was soon on my way over there. As luck would have it, she had a nursing mama who was willing to accept the newcomer, and the kitten was soon warm and fed, and a couple of months later she was adopted to a good home.