My female house finch has markings on the chest like that but so do other birds...let us know what you think it is after checking it out
I Googled it and it is Song Sparrow. I am raising him for his nest was wrecked and 1 siblings were dead on the ground another died a few hours later and this one survived. I will get him eating independently and then release him slowly. He is doing very well now and cuter than a button.