The type of animal that develops inside an egg is called an oviparous animal. These animals lay eggs that contain a developing embryo, which receives nutrients from the yolk. Examples of oviparous animals include many species of birds, reptiles, amphibians, and fish. The eggs provide a protective environment for the developing young until they hatch. This reproductive strategy allows the offspring to emerge into their environment with a degree of independence, although survival rates can vary widely depending on species and environmental factors.