Seven Puget Sound killer whales are missing and presumed dead in what could be the biggest decline among the sound's orcas in nearly a decade, say scientists who track the endangered animals.
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Seven killer whales missing
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How to save killer whales
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Search called off for missing scalloper
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Officials searching for right whales
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Whale shark found dead
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Environmental health officials called to deal with dead sheep
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China launches survey of endangered porpoises
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Search continues for missing two
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Extinctions will unshackle deadlier infections
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Scientists to discuss whale research
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'Stench of dead fish has affected business'
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Killer Whales to be charged with murder in future
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Koala may head towards extinction
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Two dead gray whales wash ashore in Washington
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'Alien' sea creatures identified
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Coast Guard searching for missing fisherman
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Merchant vessels search for survivors