Twins have been rare in human history and for that reason can seem special. Many cultures associate twins with health and vitality, while others see them as a philosophical reminder of the duality of ...

A female Japanese macaque nursing her few days old infant. Japanese macaques, also known as snow monkeys, give birth in spring to early summer. This early summer birthing season allows the infant to ...

Most animals, including other primates, give birth alone, but humans require assistance during childbirth due to the physiological complexities of the process. A new Dartmouth-led study finds that ...