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Either way, the farm chicken you see today is basically the outcome of genetic selection throughout history. Generally, vipers are the snakes that don’t lay eggs, only a few like Psedocerastes, Cerastes, and Echis species are oviparous. The reason that some animals lay eggs is because that is more beneficial to them than than it is to give birth to a live offspring. There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs. Other classes lay eggs. Frogs are egg-laying amphibians which have soft gelatinous eggs requiring constant hydration. There are about 224 species of Vipers in the world, and only some of them lay eggs. In mammals, Echidna and platypus are egg-laying. Animals which reproduce by giving birth to their young ones are called viviparous animals. Birds, insects, reptiles and fishes are oviparous animals. These animals do not lay eggs. They do not have teats to nurse their young. Animals which reproduce by laying eggs are called oviparous animals. Indo-Pacific geckos are parthenogenic animals. Student will gather research information on egg-laying animals. A female platypus lays eggs in the special holes or burrows while a female echidna, on the other hand, lays egg in her pouch. Usually, animals that are in the same class have babies in the same way: by laying eggs or through live birth. However, laying eggs doesn’t dependent on the rooster’s presences. Female platypus can lay two eggs at a time while an echidna can lay only one egg at a time. Most mammals, like humans and dogs, have a live birth. Almost all fishes are oviparous. Except for some species of snakes, all other reptiles are oviparous. Beside egg-laying, monotremes possess other traits that separate them from other mammals. Student will communicate newly-obtained information in the form of a report, outline, sentences, pictures, (however you want them to display it) Student will give an oral presentation to the class. Egg-laying mammals belong to a group called monotremes. There are many other differences in their body structure, feeding habits, diet and so on. Pages in category "Creatures that lay eggs" The following 76 pages are in this category, out of 76 total. Among mammals, only the platypus and four species of echidna lay eggs. Egg laying is common to all species of birds and most reptiles, though several species of snakes and lizards are viviparous. Instead, it depends on the hen’s hormonal cycle. The answer is yes, hens in captivity lay eggs every day. All birds lay eggs with a typical hard calcium shell. New Mexico Whiptail . Mammals like cat, dog and man are viviparous animals. The Duck-billed platypus. 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