The crow's chief note is the hoarse haw, haw with which everybody is familiar, and which seems capable of expressing everything, from the soft chatter of going to bed in the pine tops to the loud derision with which he detects all ordinary attempts to surprise him.
"Ways of Wood Folk"
William J. Long
An examination with the oiled hand detects the presence, in the passages, of the hind feet and usually the hind legs up to above the hocks.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
At this stage the ear detects a dry friction murmur, resembling somewhat the sound made by rubbing two pieces of sole leather together.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler