Sometimes there is a champing of the jaws and a very free flow of Glairy saliva dropping from the mouth.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In a paroxysm, the child coughs so long and so violently, and expires so much air from the lungs without inspiring any, that at times he appears nearly suffocated and exhausted; the veins of his neck swell; his face is nearly purple; his eyes, with the tremendous exertion, almost seem to start from their sockets; at length there is a sudden inspiration of air through the contracted chink of the upper part of the wind-pipe-the glottis-causing the peculiar "hoop;" and after a little more coughing, he brings up some Glairy mucus from the chest; and sometimes, by vomiting, food from the stomach; he is at once relieved, until the next paroxysm occur, when the same process is repeated, the child during the intervals, in a favourable case, appearing quite well, and after the cough is over, instantly returning either to his play or to his food.
"Advice to a Mother on the Management of her Children"
Pye Henry Chavasse
Where do these Glairy creatures pick up this science?
"The Life of the Spider"
J. Henri Fabre