The key to your question is 'part of the year'.
Polar bears naturally feed on seals and need the
ice pack for their hunting grounds. The polar
bears wait by a breathing hole until the seal
pokes its head up then pounces. The polar bears
also travel on the open ocean by moving from ice
berg to iceberg looking for food.
bears do survive by scavenging but that is not the
best diet for them.So unless there is a steady
diet of seals, bringing them strictly onto a land
based habitat is not a good option.
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