It typically takes up to three generations of butterflies to make the complete journey. This means that the navigation information is genetically programmed.
An international team reasoned there had to be a purpose for sleep. In one of the largest datasets ever collected, they believe they found two functions.
Watches are everywhere on the heath. Look up, look down, look inside; biology runs on time.
Living things are on the move everywhere. Why do some of them go to great lengths to migrate, while others stay put?