The sperm whale likely died of an infection after it could not expel all the plastic.
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A lack of new babies for endangered Northern Atlantic right whales makes their future even more uncertain.
Biologists have accused a killer whale of murdering another whale's child. Here are the facts of the case.
A commercial fisherman in Australia spotted an alarming site this morning: Upward of 100 whales were stranded and dying on a beach at Hamelin Bay, about 180 miles south of Perth.
Boaters, cruising off the coast of Hawaii, came across what looked like a giant, used tissue floating in the water.
Remarkably diverse communities of ocean life make their home in waters near Mexico's Revillagigedo Islands, now a protected marine reserve.
Mexico President Nieto designated a Pacific Ocean region teeming with biodiversity as a protected marine area.
Hundreds of hungry polar bears were treated to a whale of a buffet last week when the carnivores descended on a whale carcass on the coast of Russia's Wrangel Island.
The graceful whale swims by undulating its wide tail up and down, while the shark swims by moving its tail side to side. Why the difference?
A deadly gang of orcas roving off the coast of northern California is meeting surprising opposition – humpback whales trying to foil their kills.
A newborn humpback whale learns early in life to use its "indoor voice" to avoid attracting the attention of nearby killer whales.