Chickens Arent the Only Ones: A Book About Animals that Lay Eggs by Ruth HellerThe wonderful world of eggs.
This book just talks about different kinds of birds that lay eggs, and then mentions reptiles that lay eggs, dinosaurs, amphibians, a bunch of different kinds of fish, and then spiders, insects, and then the two mammals that lay eggs.
The biggest issue that I have with this book is the first few sentences that spread across the first three pages. CHICKENS laid the eggs you buy, the eggs you boil or fry or dye! or leave alone so you can see what grew inside naturally. No, thats not how you hatch a chicken. You cant hatch a chick from an egg that you buy at the grocery store. There may be stores which sell fertilized eggs, but the eggs at the grocery store are not fertilized, and they are chilled so they certainly wont hatch. If they were fertilized, and you left them with the chicken, they would hatch naturally, and grow a chicken. I dont know why that part is there.
I actually learned some stuff from this book. I wouldnt have assumed necessarily that every single bird lays eggs, but they do. Dinosaurs who are extinct, but they were reptiles too. Thats a case of TV Tropes Science Marches On-- we now know dinosaurs were more like birds. And there actually is one kind of amphibian that has claws (the African clawed frog, according to Wikipedia), but thats not a big deal (although it would have been a neat thing to mention). No other amphibian has claws, and thats a good rule of thumb to tell amphibians from reptiles. Ive never heard spiny echidnas called spiny anteaters, but apparently thats another name for them (one of the famous two egg-laying mammals, the other being the platypus). She also says the ostrich lays the largest egg, and then mentions dinosaurs. Im going to guess that at least some dinosaurs had eggs larger than ostrich eggs.
But if shes going to bite the bullet and talk about reproduction and having babies, she might as well mention that what we think of as eggs are actually shells that contain an egg. Not all eggs have shells, and other animals that dont lay eggs still make eggs internally. She mentions on the last page that animals who dont lay eggs have babies born alive and well. So, basically, animals that dont lay eggs dont lay eggs. Of course, not all animals bear their young; some starfish, for example, can shed an arm which will grow into a new starfish. And not to be a downer, but not all animal babies are born alive and well.
Message: Different kinds of animals lay eggs.
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Can You Identify These Fluffy Animals?
There are only five living monotreme species: the duck-billed platypus and four species of echidna also known as spiny anteaters. All of them are found only in Australia and New Guinea.
Oviparous animals are animals that lay eggs. Fertilization is either internal or external but the eggs hatch in an external environment and not in the mother's womb. Oviparous animals include birds, reptiles, amphibians, and fish. There are only two mammals that are oviparous ; the platypus and four species of echidnas. Some oviparous animals are ovoviviparous meaning they incubate the eggs within the body instead of a nest; they include snakes and sharks. Viviparous animals are animals that give birth to living young ones.
Mammals give birth to live young, right? Mammals are hairy, produce milk, are warm-blooded, and give birth to live young …except for two animals. There is a group of mammals, called monotremes, that lays eggs instead of giving birth to live young. Monotremes are a pretty exclusive bunch. There are three or four types of echidna, with several subspecies. The Duck-Billed Platypus.
All rights reserved. A carpet python hatches from its egg in Australia. Mother pythons guard their eggs until they hatch. While snakes are pretty unique in the animal kingdom, on this one they have to share the spotlight. A Kama Sutra of Courtship Moves.