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200,000 years ago, when glaciers covered most of Eurasia and the Arctic Ocean was frozen over.
One group of brown bears wandered off because of competition and likely became isolated in the far North by glaciers.
Many died of starvation but those who survived adapted to have thicker, lighter colored coats.
Polar bears began by scavenging on seal carcasses but later hunted them when they came up to breathe. This is an important evolutionary step.
Through evolutionary process the brown bears evolved to have white coats that camoflauge. They also developed jaws that are specific for eating seals instead of berries.
Brown bears and polar bears remain close relatives and are still able to interbreed to this day.
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