Viviparous refers to a reproductive strategy in which animals give birth to live young rather than laying eggs. In viviparous species, the developing embryos receive nourishment directly from the mother, often through a placenta, allowing for a more extended developmental period inside the body. This method is common in many mammals, including humans and dogs. In addition to mammals, some reptiles and fish also exhibit viviparous reproduction. This adaptation can provide advantages in certain environments, such as increased survival rates for the young and the ability to give birth in safer locations. Overall, viviparity is an important aspect of animal reproduction.