Sort sol (bird flock)
Encyclopedia
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 starling
s 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.
Jutland
Jutland , historically also called Cimbria, is the name of the peninsula that juts out in Northern Europe toward the rest of Scandinavia, forming the mainland part of Denmark. It has the North Sea to its west, Kattegat and Skagerrak to its north, the Baltic Sea to its east, and the Danish–German...
, Denmark
Denmark
Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...
, in particular the marsh near Tønder
Tønder
Tønder is a municipality in Region of Southern Denmark on the Jutland peninsula in south Denmark. The municipality covers an area of 1,278 km², and has a total population of 40,367...
and Ribe
Ribe
Ribe , the oldest extant Danish town, is in southwest Jutland and has a population of 8,192 . Until 1 January 2007, it was the seat of both the surrounding municipality, and county...
. Very large numbers of migrational starling
European Starling
The Common Starling , also known as the European Starling or just Starling, is a passerine bird in the family Sturnidae.This species of starling is native to most of temperate Europe and western Asia...
s 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
Baltic Sea
The Baltic Sea is a brackish mediterranean sea located in Northern Europe, from 53°N to 66°N latitude and from 20°E to 26°E longitude. It is bounded by the Scandinavian Peninsula, the mainland of Europe, and the Danish islands. It drains into the Kattegat by way of the Øresund, the Great Belt and...
.
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
Danish language
Danish is a North Germanic language spoken by around six million people, principally in the country of Denmark. It is also spoken by 50,000 Germans of Danish ethnicity in the northern parts of Schleswig-Holstein, Germany, where it holds the status of minority language...
for "black sun"). Sort sol in the marsh near Tønder
Tønder
Tønder is a municipality in Region of Southern Denmark on the Jutland peninsula in south Denmark. The municipality covers an area of 1,278 km², and has a total population of 40,367...
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.