ID (by sound) help please

[ronbco]

In a grassy field in Longmont heard an unfamiliar call.
fairly high pitched, 6-10 single notes evenly spaced in about 3 seconds (so pretty quick), slightly descending (perhaps a 3rd interval)
the bird must have been in a tuft of grass
I heard it very close, sounded like within 8 ft so I moved slowly to try to see it and in a minute or so it sounded about 8 ft further ahead, repeated with same result
so the sound is such that the location is deceiving and/or the bird moves very, very slyly

Ron Bolton
Berthoud CO

[Joey Kellner]

To me the description matches perfectly that of a Thirteen-lined Ground Squirrel.  Habitat matches this species as well.  :-)

 

Joey Kellner

Littleton, CO