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Killer squirrels have developed taste for flesh — and voles are running for their lives
Ground squirrels have turned into carnivorous killers in a local park after vole numbers exploded in Contra Costa County, California.
Orca gang develops brutal hunting strategy to take on the world's largest shark — 'This is a fascinating behaviour'
The orca attacks appear to be led by a large adult male, suggesting that he may be leading the charge on this predatory behavior.
Octopuses burn more calories changing color than you use on a 25-minute run
For the first time ever, marine biologists have measured how much energy octopuses really need to change color — and it's a lot.
Wild animals that experience trauma are half as likely to survive, study finds
New research finds that marmots who experience adversity early in life have a lesser chance of survival.
Rat poison is ripping through the food chain, threatening predators at the very top
Rat poison detected in around a third of wild mammal carnivores — including those that don't normally eat rodents, such as mountain lions and gray wolves.
How many animal species have humans driven to extinction?
Animals are disappearing too fast for researchers to record all of the extinctions we've caused.
12 of the biggest birds on Earth
Reference From 9-foot tall ostriches to albatrosses with gargantuan wingspans, here are some of the biggest birds in the world.
Bear vs tiger: Watch 2 of nature's heavyweights face off in the wild in India
Visitors at a tiger reserve in India recently filmed an encounter between a tigress and a bear, with the bear charging after the tigress but deciding at the last minute it was not worth the fight.
