What Bird Is This On The Madison Isthmus?

This morning the entire area has a large swarm of the bird pictured below searching the grass for something to eat.   Clearly they are migrating and the birds number in the many hundreds as they all land on the lawns and then when something spooks one of them they all fly in a united fashion to the security of the trees.    They are a pretty bird but walk in the grass a little different than most birds in that it is not a smooth movement–instead it appears to me they are a bit choppy with their movements.  I mention this to perhaps allow others to identify them for me.

Thanks in advance for any information.