These birds were useful in picking parasites from between the monsters' teeth.
"Reminiscences of a South African Pioneer"
W. C. Scully
These parasites have not yet been discovered in the United States, although the natural conditions are such in some parts of the country that they are liable to become established if introduced.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Fortunately not all these parasites occur in this country-many are uncommon, and many are comparatively harmless.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler