By laying eggs, a parent-to-be has the advantage of moving around pretty much unencumbered to hunt for food, protect the nest or escape a bigger creature looking for a meal. Most fish and amphibians are oviparous as well. Ostriches lay the largest eggs of any living bird. Birds quickly form and lay an egg covered in a protective shell that is then incubated outside the body. As a matter of fact, there are only 2 types of mammals that lay eggs in the world nowadays. No wonder some animals evolved to lay eggs instead! Egg laying is common to all species of birds and most reptiles, though several species of snakes and lizards are viviparous. Among mammals, the monotremes (four species of echidna, and the platypus) are oviparous. Oviparity occurs in all birds, most reptiles, some fishes, and most Arthropoda. It is a normal thing for mammals to not lay eggs, but it is a rare and unique case when they do lay egg. Among mammals, only the platypus and four species of echidna lay eggs. There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs. The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. Some online sources, such as Goddess Gift, claim this story is very old indeed. The Duck-billed platypus. Even some animals have an egg tooth temporarily that helps them to break out. One popular story you might have seen recently involves the origin of the Easter Bunny. However, compared to the bird's size they are quite small. In one year, she will lay over 300 eggs—three times the number of eggs a hen would lay in 1920. But this egg tooth is not their original tooth it is just a hard deposit usually on the beak that usually falls after some days of hatching. This case is known as monotremes, the term that refers to the structural differences in the animals of that group. All 9,000 species of birds have the same approach to motherhood: every one lays eggs. The study or collecting of eggs, particularly bird eggs, is called oology. We learn early on in school that what one of the distinguishing characteristics of mammals is that unlike birds, reptiles, and fish they bear live young. Mammals (from Latin mamma "breast") are a group of vertebrate animals constituting the class Mammalia (/ m ə ˈ m eɪ l i ə /), and characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or hair, and three middle ear bones.These characteristics distinguish them from reptiles and birds… Actually when the animal inside the egg finishes all the oxygen, nutrition and space inside the egg they starts hatching. That's because laying eggs is exhausting, requiring more calcium than their body can often produce, leaving their bones weak and easily broken. 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