This is a species of sparrow that has a ton of potential taxonomic splits in the future. The one I see the most is the standard Savannah that we see a ton of all the coastal plain. Here is one from the beach at Fort Fisher, NC.
We also get the pale Ipswich sub-species which I am having trouble locating pictures for in my files.
Then we have this darker sub-species (Belding's) from southern California. I photographed it at Tijuana Slough.
This one from Arizona was interesting due to the prominence of the yellow loral color.