Seasonal changes impel a wide variety of creatures to begin their epic migrations. Watch the full episode now.
Mar 18th, 2009 | 15 comments | 16,414 Views

Seasonal changes impel a wide variety of creatures to begin their epic migrations. Watch the full episode now.
Three birds -- the whooping swan, the ptarmigan, and the gyrfalcon -- figure prominently in Icelandic myth.
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