egg

Eggs of various birds, a [[turtle, various cartilaginous fish, a cuttlefish and various butterflies and moths. (Click on image for key)|right|thumb|link=File:Adolphe_Millot_oeufs-fixed.jpg#Key]]

AI overview

An egg is a reproductive cell or structure produced by certain animals, including birds, turtles, fish, cuttlefish, and insects like butterflies and moths. Eggs matter because they are how many animal species reproduce and develop new generations.

AI-generated from the Wikipedia summary — may contain errors.

~30 min read

Encyclopedic overview

27 sections

Contents

Eggs of different animal groups
Fish and amphibian eggs
Amniote eggs and embryos
Bird eggs
Shell
Shape
Colours
Predation
Mammalian eggs
Invertebrate eggs
Evolution and structure
Formation
Scientific classifications
Egg size and yolk
Microlecithal
Mesolecithal
Macrolecithal
Egg-laying reproduction
Human use
Food
Eggs and Kashrut
Vaccine manufacture
Culture
Collecting
See also
References
External links

Eggs of various birds, a [[turtle, various cartilaginous fish, a cuttlefish and various butterflies and moths. (Click on image for key)|right|thumb|link=File:Adolphe_Millot_oeufs-fixed.jpg#Key]]

An egg is an organic vessel grown by an animal to carry a possibly fertilized egg cell – a zygote. Within the vessel, an embryo is incubated until it has become an animal fetus that can survive on its own, at which point the animal hatches. Reproductive structures similar to the egg in other kingdoms are termed "spores", or in spermatophytes "seeds", or in gametophytes "egg cells".

Excerpted from Wikipedia’s “egg” article, available under the CC BY-SA 4.0 licence.