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