Baby American Robins pack up all of their stuff and leave the nest when they are about 13 days old. June 23, 2020 Gail Batt Baby American Robins pack up all of their stuff and leave the nest when they are about 13 days old. Fledged starlings trying to remember each other’s names. A faded rainbow, a fading rainbow and not a single treasure chest. And now for something completely different: A Fox Squirrel eating an avocado.