Siberian jays can suss out relatives they've never met, and can sense how closely related they are to these unfamiliar birds.
How are we related to trees? Can we be considered relatives?
Inbreeding is the term used when animals mate with their relatives. Learn more on this Moment of Science.
You think you've got lots of ants? Read on. Ant Super-colonies on this Moment of Science.
This is known as a genetic bottleneck, and it meant that the remaining cheetahs were forced to breed with their relatives.
Do lemmings really follow each other off a cliff to their death? No, but there are mysteries surrounding the rodents. Over the years, there have been many tales of these Arctic rodents voluntarily jumping off cliffs and plummeting into the sea.