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Sort sol is a nature phenomenon in the marshlands in southwestern Jutland, Denmark, in particular the marsh near Tønder and Ribe Very large numbers of migrational starlings gather there in spring and autumn when they move between their winter grounds in southern Europe and their summer breeding grounds in Scandinavia and other countries near the Baltic Sea
Sort sol takes place in the hours just after sunset The birds gather in large flocks and form huge formations in the sky just before they decide for a location to roost for the night The movements of the formations have been likened to kind of a dance or ballet and the birds are so numerous that they seem to obliterate the sunset, hence the term "sort sol" Danish for "black sun" Sort sol in the marsh near Tønder can occasionally comprise a formation with up to one million birds Usually flocks break up when the number of individuals exceed about half a million birds due to excessive internal disturbances in the flock
If a predator bird enters the flock, the starlings initiate a veritable bombardment with droppings and vomit that soil the feathers of the predator In rare cases the sticky deposits may render the predator unable to stay airborne Over 20 years, there have been two confirmed cases of young northern goshawks that drowned because the incident took place over water
- Flock birds
- Gram, Iver 1999 "Sort sol over Tøndermarsken" Naturens Verden 82 8 pp 14–19
- "Sort Sol i Tøndermarsken" DR 3 April 2008 Retrieved 12 August 2009 include link to a photo series
- "Black Sun in Denmark" Earth Science Picture of the Day 2006-06-19 Retrieved 2007-11-14
- 7 Incredible Natural Phenomena you've never seen - Denmark's Black Sun no6
- Private video footage of Black Sun
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