I think the pair of crows has forgiven me for rescuing the garter snake yesterday. One crow was outside foraging, so I went outside, crouched down, and clicked at it. It flew up to my roof to watch, and I scattered a handful of Cheez-its. It didn't want to come down, so I went inside, staying visible through the door, and the crow flew right down and grabbed most of the Cheez-its. Its partner joined in as it took what it gathered across the way to a puddle for dunking. Things seem okay.