Vivipaarid

Vivipaarid refers to animals that give birth to live young, which have developed inside the mother's body. This contrasts with oviparity, where offspring develop within eggs laid by the mother. Viviparity is a reproductive strategy found in a wide range of animal groups, including many mammals, some reptiles, a few amphibians, and numerous fish.

In most viviparous animals, the developing embryos receive nourishment and oxygen directly from the mother through specialized structures. In mammals, this is primarily accomplished via the placenta, a temporary organ that facilitates nutrient and gas exchange between the maternal and fetal circulatory systems. In some other viviparous species, such as certain sharks or snakes, the young may be nourished by yolk sacs within the mother or by specialized uterine secretions. The duration of gestation, the complexity of embryonic development, and the degree of parental care after birth can vary significantly among viviparous species. This mode of reproduction is advantageous as it can offer increased protection and a more stable environment for the developing young compared to eggs laid externally, potentially leading to higher survival rates.