It's not commonly found in these areas. A white whale was spotted in a river near Oslo

From SME, Bratislava:

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Beluga whales, which grow up to five meters long, are usually found much further north, near Greenland or in the Arctic in areas north of Norway or the Russian Federation.

A rare sight has captivated residents and baffled scientists: a beluga whale, typically an inhabitant of the frigid Arctic waters, has been spotted swimming in a river in southern Norway, a considerable distance from its usual domain. The whale, identified by its distinctive white coloration, was seen in the Drammenselva river, not far from the capital city of Oslo.

This unusual occurrence has drawn attention due to the species' typical migratory patterns. Beluga whales, known for their adaptability and reaching up to five meters in length, are usually found in the icy waters near Greenland, the Arctic, or the northern reaches of Russia and Norway. Their presence in a river in southern Scandinavia is highly irregular, prompting questions about the reasons behind this unexpected journey.

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We don't know why it swam this far, but this marine mammal is usually not found in southern Scandinavia.

Marine researchers suggest that such deviations from normal behavior can be driven by various factors, including the search for food, mating, or escaping predators. While the whale in question appeared to be in good health and was swimming normally, its exact motivation for traveling so far south remains a mystery. It is known, however, that belugas can navigate freshwater environments, which explains its presence in the river.

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It can swim in freshwater too.

The sighting raises concerns, as while the whale might be able to find its way back to its natural habitat, prolonged contact with humans is not ideal. The advice from experts is to observe from a distance and allow the animal to proceed without interference. This peculiar event serves as a reminder of the vastness of the ocean and the sometimes-unpredictable lives of its inhabitants, offering a unique glimpse into the natural world that rarely ventures so close to urban centers.

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Theoretically, it should be able to find its way back to its natural environment, but contact with humans is not ideal. The only thing we can do is leave it alone.