There is a traditional dichotomy in vertebrate reproduction: species either lay eggs or have live births. It is a normal thing for mammals to not lay eggs, but it is a rare and unique case when they do lay egg. Eggs, Babies or Both. Mammals give birth to their babies. Live birth or egg laying might seem like a definitive either-or choice for a species, but surprisingly, that’s not always the case. This ability has fascinated biologists and study into the area, especially as it can help us to better understand genetic development [1] and other anomalies in nature. Most people know that some animals are born live and some animals hatch from eggs. In viviparous reptiles, eggs mature in the animal’s oviduct until they appear as baby versions of the adult. Reptiles that give birth to live young are called viviparous. Our earliest vertebrate (animals with backbones) ancestors laid eggs, but over millions of years of evolution, some species began to give birth to live young. Displaying top 8 worksheets found for - Animals That Lay Eggs And Animals That Give Birth. Animals look after their babies till the babies grow enough to take care of themselves. Our earliest vertebrate (animals with backbones) ancestors laid eggs, but over millions of years of evolution, some species began to give birth to live young. Birds generally lay 1 to 17 eggs at a time Whittington and her team study the Australian three-toed skink (Saiphos equalis), a lizard with the remarkable distinction of being able to both lay eggs and give birth to live young. Most people can even name one or two examples of both of those types of animals. Birds also lay eggs, with a very hard outer shell. Though armadillos have an unearthly appearance, they still are mammals and they give birth to their young. Viviparous animals are those which develop the embryo inside the body and which give live birth. Duck young one is duckling. Name of some animals and their young ones: Hen young one is chick. According to the logic of nature, mammals are supposed to give birth to live young. Test your knowledge here! Egg laying mammals are oviparous as their embryo develops outside the body. Yet anything is possible, and mammals that lay eggs do exist. Some animals lay eggs. Some animals give birth to their babies. Reptiles usually lay eggs, and the babies then grow inside the egg until they are ready to come out. For instance, the large hairy armadillos have a gestation period of about 2 months. Viviparous vertebrates retain their fertilized eggs in their body until the offspring is ready to be born. Sometimes reptiles will give birth like mammals, without eggs. Armadillos have a gestation period of around 2 to 4 months. Our earliest vertebrate (animals with backbones) ancestors laid eggs, but over millions of years of evolution, some species began to give birth to live young. Armadillos do not lay eggs. But only a true animal lover will be able to get a perfect score on this quiz. 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