Sheaths also swell as a result of being dirty.. Horses with large beans (accumulations of secretions at the end of the penis) and large accumulations of sheath smegma (normal pasty secretion) often swell. Horses that urinate into their sheaths tend to have dirtier sheaths and more problems with swelling.
Some people think Alaska has less sunlight than other places. The opposite is true. Averaged over an entire year, Alaska gets 10-17 minutes more daylight per day than the rest of the country. If you include civil twilight, Alaska gets 40 minutes more light on average than the rest of the country.
February 1 is the shortest day of the month with 10.52 daylight hours; February 28 is the longest day with 11.34 hours of daylight. It is this increase in daylight that is responsible for the increase in sunshine hours. While January days had 7 hours of sunshine, February has 8 hours of sunshine per day on average. A slight decrease in cloud cover may also play a small part in that rise in sunshine hours, although it is minimal. Cloud cover decreases from 43% to 38% in the course of the month.