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 glass Pint glass A pint glass is a form of drinkware made to hold either a British ("imperial") pint of or an American pint of . These glasses are typically used to serve beer, and also often for cider. The common shapes of pint glass are: Pint glasses became popular in the United Kingdom in the early/mid-20th century, replacing tankards (pewter, ceramic, and glass). This change is notably lamented by George Orwell in his 1946 essay "The Moon Under Water". Older styles include: In the United Kingdom, draught beer must be sold in Imperial measure (see ). United Kingdom law requires