From sea lions to killer whales (and even polar bears), there's a great diversity of marine mammals living across Earth's oceans. At Live Science, we guide you through the underwater worlds of our marine relatives with the latest news, features and articles, so whether our expert writers and editors are explaining why deep-diving mammals don't black out or reporting on a gray whale breaking the mammal migration record, you'll always have interesting marine mammal facts to read.
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Living lunch box? Iceland orcas are unexpectedly swimming with baby pilot whales, but it's unclear why.
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'Incredible and rare' sight as endangered whale attacked by 60 orcas in brutal hunt
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Dolphins: Facts about the intelligent marine mammals that use tools to hunt
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Whales: Facts about the largest animals on Earth
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'I thought I was dead': Terrifying video of humpback whale gobbling up kayaker explained
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Orcas off Antarctica filmed teaching calves to hunt in incredible new footage
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Orcas: Facts about killer whales
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Living lunch box? Iceland orcas are unexpectedly swimming with baby pilot whales, but it's unclear why.
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'Incredible and rare' sight as endangered whale attacked by 60 orcas in brutal hunt
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Dolphins: Facts about the intelligent marine mammals that use tools to hunt
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Orcas off Antarctica filmed teaching calves to hunt in incredible new footage
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Orcas: Facts about killer whales
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Grieving orca mom carries dead calf around on her head for a 2nd time
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Orca gang develops brutal hunting strategy to take on the world's largest shark — 'This is a fascinating behaviour'
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Orcas start wearing dead salmon hats again after ditching the trend for 37 years
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QuizOrca quiz: Will you sink or swim?
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Groovy! Dancing Sea Lion Keeps a Beat
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Swarm of rainbow-colored starfish devour sea lion corpse on seafloor
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No one knows why decapitated sea lions keep turning up in Vancouver Island
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Terrifying Video: Why a Sea Lion Pulled a Little Girl into the Water
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OpinionSea Lion 'Aerospace': High-Thrust, Low Wake
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No Tusks: Ancient Walrus Cousin Looked More Like a Sea Lion
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OpinionAutopsies from Space: Who Killed the Sea Lions?
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Sea Lions React To Sonar
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Sea Lion Species Removed from Endangered Species List
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Groovy! Dancing Sea Lion Keeps a Beat
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Swarm of rainbow-colored starfish devour sea lion corpse on seafloor
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No one knows why decapitated sea lions keep turning up in Vancouver Island
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Terrifying Video: Why a Sea Lion Pulled a Little Girl into the Water
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Opinion
Sea Lion 'Aerospace': High-Thrust, Low Wake
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No Tusks: Ancient Walrus Cousin Looked More Like a Sea Lion
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Opinion
Autopsies from Space: Who Killed the Sea Lions?
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Sea Lions React To Sonar
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Sea Lion Species Removed from Endangered Species List
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Rabid seals are attacking people in South Africa
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Bird flu wipes out over 95% of southern elephant seal pups in 'catastrophic' mass death
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Mystery mass death of seals on remote, uninhabited Siberian island under investigation
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World's rarest seals have a secret breeding cave in Cyprus
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Seals are making 'Star Wars' noises at each other underwater, and we have no idea why
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Eerie seal 'ballet' beneath Antarctic iceberg wins underwater photo prize
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Seal caught clapping underwater … and scientists flip out
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A Seal Has Taken Up Residence in Manhattan, and Its Human Neighbors Are Thrilled
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Dozens of Seals Turn Up on Icy Streets in Canada. Here's Why.
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Whales: Facts about the largest animals on Earth
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'I thought I was dead': Terrifying video of humpback whale gobbling up kayaker explained
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These endangered whales can live up to 150 years — twice as long as previously thought
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Male humpback whale crossed 3 oceans for sex, inadvertently breaking distance record for species
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Mysterious sound coming from the Mariana Trench has finally been explained
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Watch heartbreaking footage of humpback whale with missing tail in Washington state
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Ultra-rare whale never seen alive washes up on on New Zealand beach — and scientists could now dissect it for the 1st time
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Japan plans to commercially hunt vulnerable fin whales, enraging conservationists
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Sperm whales drop giant poop bombs to save themselves from orca attack
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