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. They are all females that lay eggs that hatch without being fertilized by a male. They do not have teats to nurse their young. Except for some species of snakes, all other reptiles are oviparous. New Mexico Whiptail . All birds lay eggs with a typical hard calcium shell. Usually, animals that are in the same class have babies in the same way: by laying eggs or through live birth. Either way, the farm chicken you see today is basically the outcome of genetic selection throughout history. Frogs are egg-laying amphibians which have soft gelatinous eggs requiring constant hydration. Among mammals, only the platypus and four species of echidna lay eggs. Student will work with a group to create model eggs and model habitat. Animals which reproduce by giving birth to their young ones are called viviparous animals. Generally, vipers are the snakes that don’t lay eggs, only a few like Psedocerastes, Cerastes, and Echis species are oviparous. The answer is yes, hens in captivity lay eggs every day. Almost all fishes are oviparous. New Mexico whiptail is one of the numerous lizards which can reproduce via parthenogenesis. Most fish and amphibians are oviparous as well. The Duck-billed platypus. There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs. Beside egg-laying, monotremes possess other traits that separate them from other mammals. All birds and one mammal. In mammals, Echidna and platypus are egg-laying. 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. Eggs are pretty small. Other classes lay eggs. There are about 224 species of Vipers in the world, and only some of them lay eggs. Student will gather research information on egg-laying animals. Egg-laying mammals belong to a group called monotremes. There are many other differences in their body structure, feeding habits, diet and so on. A female platypus lays eggs in the special holes or burrows while a female echidna, on the other hand, lays egg in her pouch. Egg laying is common to all species of birds and most reptiles, though several species of snakes and lizards are viviparous. Most mammals, like humans and dogs, have a live birth. Instead, it depends on the hen’s hormonal cycle. Explore more: Reproduction in Animals Indo-Pacific geckos are parthenogenic animals. Mammals like cat, dog and man are viviparous animals. Female platypus can lay two eggs at a time while an echidna can lay only one egg at a time. Pages in category "Creatures that lay eggs" The following 76 pages are in this category, out of 76 total. Animals which reproduce by laying eggs are called oviparous animals. 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