Bird Watching: Sandpiper ID requested..., 1 by TXSkeeter

TXSkeeter wrote:
I believe the attached image is of a 'Least Sandpiper' although it's hard to tell since the birds were some distance away and at the far limit of my lens (as well as my eyes). The image includes a Kildeer that was feeding with the flock for size comparison.
This flock of perhaps 150-200 birds was feeding on a semi-dry portion of the spillway below a local lake and seem to be there on a regular basis. Birds were very quick steppers and moved constantly with heads lowered and tails held horizontal for the most part. Sibley's Guide to Birds shows the 'Least' species to be common in my area of North TX, at least during the winter months.
I've processed the image about as far as possible without losing additional identifying marks but have additional images with flight behavior if it will help with identification.
Any help would be appreciated.
Thanks,
Steve