Though I am able to walk up to within 20ft of some (many are located just 25ft from the sidewalk), I do not always feel comfortable in doing so. Daily these birds view cars and people passing by, but testing “how close” is not something I like to do.
"Tombstone Bird"
The best to hope for is to see one sitting up on their “T” posts provided at each burrow. For me this does not happen often enough. This does provide a clear shot without interference from grasses. The other challenge is to get good even lighting. Since the usual time for shooting is during low sun angles setup is important. At the right angle their eyes do light up well.
I used a 400mm IS with an 1.4x T.C., which helped with close-ups.