Come to the Danish marshes when the sun begins its daily retreat, as it is now more than one million migratory starlings begin to think about going to bed in the spring and fall. After a day of grazing on Daddy Long Legs slender, insect larvae and other critters, the flock of black birds spotted starts a synchronized dance overhead in their search for a place to nap. The back and forth from the herd dominates the skyline, their waves as dance obscure the dim light of the sun going down, giving his name to this strange formation. When: Mid-March-mid April and mid- September-mid-October. The spectacle starts around sunset and lasts about 20 minutes.