1. Researchers say walruses hauling out on shore could lead to deadly stampedes and too much pressure on prey within swimming range.
2. Female walruses and their young have come ashore during late summer and fall in four of the last five years on Alaska's northwest coast.
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3. Walruses for years came ashore intermittently during their fall southward migration but not so early and not in such numbers.
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4. The tracking project is part of a study on how walruses respond to reduced sea ice.
5. In 2007, several thousand walruses gathered on Alaska's northwest shore for the first time.