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. It is a normal thing for mammals to not lay eggs, but it is a rare and unique case when they do lay egg. 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. Viviparous vertebrates retain their fertilized eggs in their body until the offspring is ready to be born. The gestation period may vary with the species of armadillos. Babies growing in eggs. According to the logic of nature, mammals are supposed to give birth to live young. Test your knowledge here! 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. Animals look after their babies till the babies grow enough to take care of themselves. Sometimes reptiles will give birth like mammals, without eggs. Eggs, Babies or Both. Egg laying mammals are oviparous as their embryo develops outside the body. Armadillos have a gestation period of around 2 to 4 months. Live birth or egg laying might seem like a definitive either-or choice for a species, but surprisingly, that’s not always the case. Armadillos do not lay eggs. Displaying top 8 worksheets found for - Animals That Lay Eggs And Animals That Give Birth. Yet anything is possible, and mammals that lay eggs do exist. But only a true animal lover will be able to get a perfect score on this quiz. Mammals give birth to their babies. For instance, the large hairy armadillos have a gestation period of about 2 months. Some animals lay eggs. In viviparous reptiles, eggs mature in the animal’s oviduct until they appear as baby versions of the adult. Some animals give birth to their babies. Viviparous animals are those which develop the embryo inside the body and which give live birth. Birds also lay eggs, with a very hard outer shell. There is a traditional dichotomy in vertebrate reproduction: species either lay eggs or have live births. Name of some animals and their young ones: Hen young one is chick. Most people can even name one or two examples of both of those types of animals. 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 Duck young one is duckling. Reptiles that give birth to live young are called viviparous. Though armadillos have an unearthly appearance, they still are mammals and they give birth to their young. 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