Whooper swans (cygnus cygnus) spend most of their time in subarctic waters of the Northern Hemisphere, where they breed. As it might tell from their wings they are powerful in flight. Each winter they migrate south in large flocks, flying hundreds and sometimes thousands of miles. Those which arrive in Ireland and Britain come from Iceland. They announce their presence in the estuaries and wetlands where they settle with a deep honking sound.
Some interesting facts:
1. Finland's national bird
2. They pair for life
3. Among heaviest bird in flight
4. Fly at altitudes up to 8,000 ft
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