Scientists have suggested that non-twin babies born to mothers of twins are heavier, and could help explain why twinning exists.

Scientists say that some European house mice have developed resistance to the strongest poisons.

Smaller squid make up for their diminutive size, and reduced sexual status, by producing bigger sperm, scientists discover.

An enormous jawbone found in Kazakhstan adds weight to the idea that giant birds existed at the same time as the dinosaurs.

Gibbons put an extraordinary amount of energy into their leaps, making up for a body that is not adapted for jumping, scientists find.

Scientists say that there has been a mysterious decline in the growth of methane in the atmosphere in the last decades of the 20th century.