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IMAGE: These 12,000-year-old stickleback bones were found in Finnmark by researchers from the Norwegian Geological Survey (NGU). They were well enough preserved that biologists could identify the species and learn. view more
Credit: Photo: Anders Romundset, NGU / NTNU
The last ice age ended almost 12 000 years ago in Norway. The land rebounded slowly as the weight of the ice disappeared and the land uplift caused many bays to become narrower and form lakes.
Fish became trapped in these lakes.
Sticklebacks managed to adapt when saltwater became freshwater, and they can still be found in today s coastal lakes along the Norwegian coast.