One of the most majestic sights at Martin Mere is the Whooper Swan, one of Britains two migratory swan species, the other being Bewick's. Whoopers breed in Iceland and migrate to Britain for the winter, often flying at altitudes of over 29 000 feet whilst on migration, and enduring temperatures of minus 28 degrees Centigrade. All swans have white plumage, except the Black Swan of Australia and the Black Necked Swan of South America. Swans never dive, but have long necks which are used for reaching underwater food, rather like an underwater Giraffe!