A research effort conducted by an international team of scientists revealed signs of Alzheimer's disease in the brains of dolphins.
Experts at Oxford University carried out tests on an animal that washed up on the Spanish coast.
A member of the team said: "It is very rare to find signs of full-blown Alzheimer's disease in non-human brains.
"This is the first time anyone has found such clear evidence of the protein plaques and tangles associated with Alzheimer's disease in the brain of a wild animal."
Find out more on the story in the video above.