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