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
Pint of beer, neither of which have a legal definition. A 375 ml bottle of liquor in the US and the Canadian maritime provinces is sometimes referred to as a "pint" and a 200 ml bottle is called a "half-pint", harking back to the days when liquor came in US pints, fifths, quarts, and half-gallons. Liquor in the US has been sold in metric-sized bottles since 1980 although beer is still sold in US traditional units. In France, a standard 250 ml measure of beer is known as "un demi" ("a half"), originally meaning a half pint. Pint The pint (,