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