Yay! Always so nice to see the magic in nature unfold, and I love the colors of your robins. I am sure that your own Robin is also ecstatic to see them. About two weeks and then they will fly, and it's always nice to get the parents feeding them when they are out of the nest.
Our robins step out in more flamboyant colors, and here's one that I got recently to show you the color differences.
I think that they change colors across the world to blend in with their environments.
Stay well my friend, and our love to the other Robin.
!PIZZA !LOLZ !LUV