Chicken or egg?
Who are the ancestors of chickens?
What is the scotoma on the white of an egg?
Why do hens only lay a maximum of one egg a day?
These questions that we have been curious about since childhood have been answered here!
Chickens are the most common poultry in our lives, but do you really know chickens?This "Encyclopedia of Chickens" is really a lesson for me and the two "curious babies".
There are 10 questions about chickens listed in the book, and there are hidden pages in each page to explain in depth, and the content is huge and interesting!
1.Chicken or egg?
Scientists believe that the earliest creatures that laid hard-shell eggs date back to 31.2 billion years ago, and the original chicken (the ancestor of domestic chickens) hatched from eggs has not long been around. So there are eggs first, and then there are chickens.
2.Who are the ancestors of chickens?
From the point of origin, the ** of the chicken's foot paws is covered with scales. Their clavicle wishbones fused left and right, and they stood on two legs like theropod dinosaurs, so birds (including chickens) may be the only surviving descendants of today's dinosaur family.
3.What is the scotoma on the white of an egg?
The dark dot on the egg white is not that the egg is bad, but that it is a fertilized egg, and this dark dot will develop into the embryo of the chicken.
4.Why do hens only lay a maximum of one egg a day?
It takes 20 minutes for the yolk of the chicken to pass through the funnel, then it takes three hours to coat the egg white from the pipe into the bulk, it takes one hour for the egg white yolk to enter the isthmus, it takes one hour to coat the eggshell membrane, and finally it takes 20 hours to enter the uterus to form the egg. Does it take at least 24 hours to form an egg?
Reading with the baby, every time I see a knowledge point, I can't help but sigh together: "Oh, so that's the case!."”
The illustrations on each page are simple and easy to understand, and the style of painting is realistic. From the introduction, history, and classification of chickens to the Xi and characteristics of chickens, to the formation of eggs and the birth of chicks, let us truly enter the world of chickens.
This "Encyclopedia of Chickens" is a very comprehensive introduction to chickens, which is a popular science book that is very suitable for parent-child reading, rigorous and interesting, so that children can understand chickens in many aspects, and know chickens from multiple angles, so as to stimulate children's curiosity about biology and lead children to explore this interesting world!