I found a little robin with a broken leg and scraped up wing. He was going to be cat bait, so I picked him up. I've had him for 12 hours now and he hasn't eaten. I offered him smooshed worms and other food, but he doesn't open him mouth and I don't want to force him. He was awake and flopping around this morning, so I put him out in our unused dog run so that he can be "in the wild", so to speak. He's chirping and calling, does that indicate he's too young to feed himself? thanks for any info. I'm calling wildlife rehabilitators later today.