1. _Swan Lake sanctuary, where thousands of trumpeter, mute and whistling swans descend each May to nest. 2. Whistling swans start leaving for the breeding grounds again by mid-March, and arrive by late May.3. Lead poisoning by ingestion of lead shot is a very significant cause of mortality also, particularly in the whistling swan . 4. There is a slight size hybridization between a Bewick's and a vagrant whistling swan has been reported from eastern Siberia. 5. Among the 180 bird species that use the refuge is the tundra swan, once more familiarly known as the whistling swan . 6. The time from laying to hatching is 29 30 days for Bewick's swan and 30 32 days for the whistling swan . 7. Swan Lake was named for two types of swans native to the state : the trumpeter swan and the whistling swan . 8. During the spring, Canada geese, snow geese, Ross'geese, and whistling swans stops in the valley to feed and rest before continuing north. 9. Of the 150 people who have attended weekend seminars at the Whistling Swan , 12 have gone on to open their own inns. 10. Bird counts have revealed more than 15, 000 ducks in autumn, 1, 000 whistling swans in spring, and 100 species of song birds.
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