Ostriches lay the largest eggs of any living bird. However, compared to the bird's size they are quite small. No wonder some animals evolved to lay eggs instead! 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. Even some animals have an egg tooth temporarily that helps them to break out. Oviparous animals are animals that lay eggs, with little or no other development within the mother. 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. Most fish and amphibians are oviparous as well. The study or collecting of eggs, particularly bird eggs, is called oology. Eggs are pretty small. That's because laying eggs is exhausting, requiring more calcium than their body can often produce, leaving their bones weak and easily broken. Some online sources, such as Goddess Gift, claim this story is very old indeed. One popular story you might have seen recently involves the origin of the Easter Bunny. The Duck-billed platypus. Actually when the animal inside the egg finishes all the oxygen, nutrition and space inside the egg they starts hatching. As a matter of fact, there are only 2 types of mammals that lay eggs in the world nowadays. All birds and one mammal. Among mammals, the monotremes (four species of echidna, and the platypus) are oviparous. Reptile eggs, bird eggs, and monotreme eggs, which are laid out of water, are surrounded by a protective shell, either flexible or inflexible. Egg laying is common to all species of birds and most reptiles, though several species of snakes and lizards are viviparous. Among mammals, only the platypus and four species of echidna lay eggs. In one year, she will lay over 300 eggs—three times the number of eggs a hen would lay in 1920. This case is known as monotremes, the term that refers to the structural differences in the animals of that group. The red jungle fowl from which she descends lays only 10-15 eggs per year. Essentially, the tale is that Ostara, the ancient Germanic goddess of the spring, transformed a bird into a hare, and the hare responded by laying colored eggs for her festival. It is a normal thing for mammals to not lay eggs, but it is a rare and unique case when they do lay egg. There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs. No bird gives birth to live young. All 9,000 species of birds have the same approach to motherhood: every one lays eggs. Birds quickly form and lay an egg covered in a protective shell that is then incubated outside the body. Egg-laying mammals belong to a group called monotremes. 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. 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