20-year study finds that bringing wolves back to Yellowstone has helped the entire ecosystem thrive
Animals
Fossil discovery in Australia reveals 'upside-down' dinosaur ecosystem with two giant predators
Octopuses burn more calories changing color than you would on a 25-minute jog
'She turns her siphon into a gun': Watch coconut octopus shoot rocks at fish in world's first footage
Science Quiz: Test Your Knowledge of Killer Whales. Will You Sink or Swim?
Killer whales have started wearing dead salmon hats again after a 37-year hiatus.
Killer whale pod develops brutal hunting strategy to take on world's biggest shark – 'It's spectacular behaviour'
Dogs may have become tamed because they liked the snacks so much, the model suggests
Why do cats have “beans” on their toes?
Watch heartbreaking photos of a 'bumpy' giraffe in South Africa with a viral disease that is rare in the tall animals.
Male humpback whale crosses three oceans for sex, inadvertently breaking distance record for species
These endangered whales can live up to 150 years – twice as long as previously thought.
