19th century, and is due to the diminutive size, being used earlier for a pony glass, and similarly for a pony keg. The best-known brands of ponies are Rolling Rock (pony introduced 1939)and Miller High Life (pony introduced 1972), and the 7 oz size of Rolling Rock likely contributed to the standardization on this size. Other major brands, such as Budweiser and Coors, are also regionally available in 7 oz bottles; these were introduced in the early 1970s, following the introduction of the size for Miller High Life. The popularity of Rolling Rock ponies has led to the folk etymology that "pony" is from the Rolling Rock horse logo. This is incorrect: the term "pony of beer" in the United States predates Rolling Rock (introduced 1939) by over 50 years, and advertising for Rolling Rock from the 1950s uses the term "pony bottle" generically, stating "... Rolling Rock is the Largest Selling 7 oz. Pony Bottle of Premium Beer in Pennsylvania". Among Mexican beers, Corona sells ponies and cuartitos, branded as Coronita, from the Spanish diminutive -ita. The American-market 7 oz. ponies come in 6-packs and the Mexican market 210 mL cuartitos come in boxes of 12. In Australia, a limited range of beers are available in a bottle, nicknamed a throwdown or grenade. Pony bottles are most popular for the on-premises market, where they are sold by the bucketful. The motivation in the 1970s was to target lighter drinkers, and to ensure that the lager beer stayed cold until finished. The market for beer in small bottles is smaller than that in regular size bottles, which cause added difficulties and expense: the bottles themselves are harder to source, and require either a separate bottling line or retooling the bottling line between runs. As a result, US craft breweries only rarely bottle in small bottles; temporary examples include Flying Dog Brewery (2007–2009) and Rogue Ales (2009–2011, using extra bottles from Flying Dog). "Darwin Stubby" A Darwin Stubby refers to several particularly large beer bottle sizes in Australia. It was first introduced in April 1958 with an capacity. The Darwin Stubby is available by NT Draught in the Northern Territory. The Darwin Stubby has an iconic, if kitsch, status in Australian folklore. "Caguama" and "Ballena" bottles In Mexico, caguama and ballena are popular names for a beer bottle. The beer brands that are sold in these bottles include Tecate, Carta Blanca,