I hope you see some babies too, although I must admit I don't know what a color change means. Update and tell us whether it hatches, and how many do.
Robins are wonderful birds, smarter than I thought. One year I rescued a chick called "Cowbird" that had fallen out of his nest, and by the time he flew away -I wanted to keep him as a companion to my cockatiel, as he was lonely at the time and I worried Cowbird would be eaten by something were he to return to the wild, but my grandfather scared him away while I was outside training him and his harness broke- I had taught him to sing on command, fly on command, and was working on returning when called when he left.
He also learned to feed other rescue birds I had, including a second, younger but less tame robin. That one was glad to fly away at its earliest opportunity, leaving my Cowbird hopping around the cage in confusion with a piece of water soaked dog food in his mouth -That's what one feeds orphaned baby birds, apparently, if anyone was curious. It also works for starlings and sparrows. Hopefully you won't need that information though, and the parent robins will do a good job of raising those babies.
