There is a traditional dichotomy in vertebrate reproduction: species either lay eggs or have live births. Eggs, Babies or Both. Animals look after their babies till the babies grow enough to take care of themselves. Reptiles usually lay eggs, and the babies then grow inside the egg until they are ready to come out. Test your knowledge here! Some animals lay eggs. The gestation period may vary with the species of armadillos. Armadillos do not lay eggs. Displaying top 8 worksheets found for - Animals That Lay Eggs And Animals That Give Birth. Viviparous vertebrates retain their fertilized eggs in their body until the offspring is ready to be born. Armadillos have a gestation period of around 2 to 4 months. 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. Reptiles that give birth to live young are called viviparous. Birds also lay eggs, with a very hard outer shell. Name of some animals and their young ones: Hen young one is chick. For instance, the large hairy armadillos have a gestation period of about 2 months. Sometimes reptiles will give birth like mammals, without eggs. 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. Birds generally lay 1 to 17 eggs at a time Yet anything is possible, and mammals that lay eggs do exist. 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. According to the logic of nature, mammals are supposed to give birth to live young. Babies growing in eggs. Though armadillos have an unearthly appearance, they still are mammals and they give birth to their young. Duck young one is duckling. 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. It is a normal thing for mammals to not lay eggs, but it is a rare and unique case when they do lay egg. Most people know that some animals are born live and some animals hatch from eggs. 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. But only a true animal lover will be able to get a perfect score on this quiz. 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. Some animals give birth to their babies. Viviparous animals are those which develop the embryo inside the body and which give live birth. 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