North Dakota and new birds!

I'm off to North Dakota next week for work, and as is often the case, I want to get out and do some birdwatching. There are two sparrows that breed in North Dakota ( and not much elsewhere in the U.S.) that I will be searching for. But as you can see by these photos - these two little buggers really look very much alike. One is a LeConte's sparrow and one is Nelson's sharp-tailed sparrow. The good news is that their songs are distinctive and I have been listening to them and learning them. So, with a little luck I will be able to add these to my life list. The more birds I see the harder the new ones get!