Photo: I snapped a shot of this fellow during a birding marathon in 2012.
Lark Sparrow (Chondestes grammacus).
A large sparrow that is easily identifiable because of the conspicuous markings on its face. Prefers grasslands in Central, Mountain, and Western parts of the US.
1) Walks rather than hops.
2) Males put on a show and strut their stuff during courtship displays.
3) Sometimes they share nests with other bird species.
Decreasing nationally, more so on the Eastern border of their range.
He curiously looked at the caravan of birders busy gawking at him. See, birdwatching is mutually entertaining for both parties.