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The main causes for population decline are predation, pollution, maritime transportation, and climate change. The main narwhal predators are hunters, killer whales [Orcinus orca], and polar bears [Ursus maritimus]. The pollution of the air and of the waters is worldwide in its scale and its impact. Maritime transportation contributes to that pollution, and also may affect narwhal migration routes. Climate change affects the life cycle of the narwhal and of narwhal predators and prey. The narwhal population has specific habitat and dietary needs. Any impact on either impacts the narwhal population.

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