External gills usually contains muscle tissue, and may be moved by the animal as a free appendage, in order to stir up stagnant water. The stalk is lined by many thinly walled filaments (fimbriae), containing the majority of blood vessels used in gas exchange. Animals usually have one external gill originating on each gill arch (except the hyoid), which leads to there being three pairs of external gills in salamanders, and four in the gilled larvae of lungfish. External gills External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside
Gills Creek The Gills Creek watershed includes over 70 miles and 47,000 acres of land made up of Gills Creek and a number of tributaries (including Jackson Creek and Little Jackson Creek, among others). The watershed is considered "one of the largest impaired urban watersheds" in South Carolina. A 1999 United States Geological Survey report found high pesticide levels in Gills Creek which could be harmful to fish populations (although not above Environmental Protection Agency drinking standards) and fecal coliform levels that make the creek not "safe for swimming or other direct bodycontact activities." The creek was named after James Gill, a