You'll see a lot of grown swans around Copenhagen's lakes throughout the year. But there's something special about the city in spring because it's spring when the little cutie cygnets are hatching. Usually, in May they make their first steps, learn to swim and be a swan. They remain gray and fuzzy generally till July-August, then they start to grow feathers just like their parents. Be attentive and maybe you'll get lucky enough to spot some.