Starling babies vs. Sparrow babies

Talked to Mike and Barbara today. Barbara gave up on the "starling" baby after 3 days of exhausting work. She turned it in to the wildlife refuge who said it was a house sparrow. They do have 2 nesting sites on their property. We were all surprised though to hear that because the baby's gape was so yellow. What we got wrong was that starlings are yellow not just around the mouth, like sparrows, but inside the mouth, like in this photo of 10 day olds for the amazing site www.starlingtalk.com.