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"Back Off, Buster!"
Female polar bears with cubs generally avoid adult male bears, which sometimes attack the young and eat them. If their paths cross, highly protective mother bears can become very ferocious. They are capable of driving off much larger males if they think their cubs are threatened.
In fact, mother bears have been known to rear up and leap at helicopters carrying research scientists when they thought they were getting too close to their cubs.
Biologists have also observed "adoption" among polar bears. In one case, a female was tagged with a different set of cubs from the ones she was accompanying just months before.
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Library: Arctic, Polar Bears, Arctic Animals
Links: Arctic, Arctic Animals
Arctic Maps & Weather Reports
DICTIONARY: Just "double-click" any unlinked word on this page for the definition from Merriam-Webster's Student Electronic Dictionary at Word Central.
ARCTIC LIBRARY & GLOSSARY: Check this section for an index of the rest of the things you really need to know about the Arctic.
ARCTIC MAPS & WEATHER REPORTS: Maps of the Northwest Passage, explorers' routes, iceberg sources, Nunavut, the Arctic by treeline, temperature...
ARCTIC LINKS: Even more information! Links to sites related to the Arctic and "Iceberg: the Story of the Throps and the Squallhoots".
GUIDE TO ARCTIC SUNRISE & SUNSET: How much sunlight or darkness is there in the Arctic on each day of the year?