Sol, Indio, Victoria, Corona Familiar and Pacífico. The name "caguama" refers to the Loggerhead sea turtle, which is called "caguama" in Spanish, and is used mostly in central and eastern Mexico. There are larger sizes of beer bottle called a súper caguama or a caguamón. The name ballena is Spanish for whale, and is mostly used along the northern Pacific coast. Gallery Closure Bottled beer is sold with several types of bottle cap, but most often with crown caps, also known as crown seals. Some beers (for example Grolsch) are sold in "beugel" style bottles, known as "flip-top" or "swing top" in some English speaking countries. A number of beers are sold finished with a cork and muselet (or cage), similar to champagne closures. These closures were largely superseded by the crown cap at the end of the 19th century, but survive in premium markets. Many larger beers, including most forties and some growlers, use screw caps due to their resealing design. Gallery Bottle fermentation Some beers undergo a fermentation in the bottle, giving natural carbonation. These beers are usually referred to as bottle-conditioned. They are bottled with a viable yeast population in suspension and to start what may be a second or third fermentation. If there is no residual fermentable sugar left, sugar and or wort may be added in a process known as priming. The resulting fermentation generates CO2 that is trapped in the bottle, remaining in solution and providing natural carbonation. Bottle-conditioned beers may be either filled unfiltered direct from the fermentation or conditioning tank, or filtered and then reseeded with yeast. Use as weapons Beer bottles are sometimes used as makeshift clubs, for instance in bar fights. As with pint glasses, the use of glass bottles as weapons is known as glassing. Pathologists determined in 2009 that beer bottles are strong enough to crack human skulls, which requires an impact energy of between 14 and 70 joules, depending on the location. Empty beer bottles shatter at 40 joules, while full bottles shatter at only 30 joules because of the pressure of the carbonated beer inside the bottle. A test performed by the television show MythBusters suggested that full bottles are significantly more dangerous than empty bottles. They concluded that full bottles inflict more damage in terms of concussion and skull fracture. However, they found that both full and empty bottles do the same amount of scalp