And Sora hatchlings too!
While following up on the Virginia Rail hatchlings, I looked for the Soras that I hear calling every time I am at the wetlands where these are found. Not only did I see at least one adult Sora but I spotted at least 3-4 Sora hatchlings. They were huddled together on top of some foilage about 20 feet into the wetland vegetation. As I was about 35 feet from them I couldn't quite see just how many there were. They appeared even a little smaller than the Virginia Rail hatchlings were when I first saw them (and when they were probably less than 7 days old).
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I only got to watch these hatchlings briefly as a parent that was patrolling near them gave some alarm calls and they retreated into the thicker vegetation. BNA says that the chicks don't usually start leaving the nest until 3-4 days old in one section then in a subsequent section cites literature indicating that they start leaving the nest at 2-3 days old "to feed nearby" (parents still give them food for 2-3 weeks but apparently they begin feeding themselves then). Interestingly it also says that hatchlings are brooded near the nest by a parent for the first 4-7 days, and that they may brood them in the water. This may be done while the other parent continues to incubate unhatched eggs. Since they usually lay 8-11 eggs, the other parent may still be on the nest.
While I was watching, a commercial jet plane flew fairly close overhead, making a lot of jet noise. The Soras made their whinny call during this disruption and I thought that they might be giving an alarm call in response to the airplane noise (I was standing still and hidden by a tree so I don't think they were calling relative to my presence at this time, though they did when I moved about the area). And BNA notes that this species does call in response to loud noises