I did a search when I posted my comment and told Jaki by pm didnt want to spoil the poll.Very interesting it is how they do it
Oh well I think I will reveal my findings
"Like other seabirds, penguins have glands in the bill that help rid the body of excess salt. The secretion of salt and fluid often collect as droplets on the bill and are shaken off. These glands are so effective that penguins can drink sea water without ill effects"