Pint glass small pits which aid in nucleation, allowing the gas within it to be released more easily, thus preserving the head. Without the aid of these pits a regular pint glass will keep a head for only 3 or 4 minutes before appearing 'flat'. The markings come in a variety of styles ranging from a simple circular or square hatched pattern to more complicated branding messages. Pint glass collecting is an increasingly popular way for individuals to commemorate their visits to popular tourist destinations, most notably to microbreweries or sports arenas. These destinations often sell pint glasses adorned with their logos,
Gills Bay more common, this area having one of the largest British populations, however the common seal is also present. Wild dogs are often spotted around the Gills area which are believed to have come across on the ferry from Orkney. Porpoises can be seen all year round in all parts of the firth and at Gills Bay as they tend to favour shallower water. Usually seen singly or in small numbers although in the autumn many large groups may be seen in Gills Bay where they congregate. Basking sharks are rare but are being seen more often around May to August.