cardinal nestlings leave nest at 9 days old

The 3 nestlings are no more. They jumped ship yesterday at 9 days old (mockers left nest on day 12 last year). All 3 babes made it to the fledgling stage. They are all now in our backyard within the confinement of our 6 foot vinyl fence. We like to call it, the great big playground. They can flap their wings, jump around, investigate, and learn life lessons all they want in here and will be pretty safe. We already know papa and mama can handle a snake and the squirrel is around but the parents do not seem upset about it at this point, so we're not either. Mama and Papa have everything under control and I tell you they are a lot more discreet and quiet about it then the mocking birds ever were. They are very hush, hush and secretive. Most people wouldn't even know what was going on unless they were incredibly observant. Mama and papa zoom around very low to the ground, faster than a speeding bullet feeding and tending to their toddlers. When a baby tried to fly they are right there beside him encouraging as if it was their first baby steps. Very cute. The parents are working together quietly (the mockers bicker a lot) and seem content and at ease. As I shot these photos they very well knew I was right there. At first, they were a bit nervous but then they carried on like I didn't exist, feeding themselves at the feeder, looking for bugs, and feeding their fledgling right in front of me.