chirr

Their call for food was a sibilant chirr, and they gave it much oftener than any of the grown-up woodpecker notes.

There were no bites immediately; but as they sat there they heard a red squirrel chirr!

"Not at all," replied the little man, in a voice as dry and crisp as the chirr of a grasshopper.

But on leading up his horse within ten or twelve feet of the pin, it gives a little "chirr" and dives down out of sight.

They have peculiar notes like a clear whistle, and a “chirr, chirr!”