Young sparrows can be tough but this one seems to be a pretty typical hatch year Swamp Sparrow. It's always a treat to walk up to the net and see something that makes you say hmmm. What a fun time of year to learn how to ID some of those birds that we don't see all the time.
As the weather stays unseasonably warm and dry the migration might stall out until the next cold front. Middle of next week we should have a whole new set of birds without "bracelets".