Egg | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-10

This is an audio version of the Wikipedia Article:
Egg


00:01:43 1 Eggs of different animal groups
00:01:59 1.1 Fish and amphibian eggs
00:03:55 1.2 Bird eggs
00:04:28 1.2.1 Colors
00:06:26 1.2.2 Shell
00:06:55 1.2.3 Shape
00:07:47 1.2.4 Predation
00:08:34 1.2.5 Various examples
00:08:42 1.3 Amniote eggs and embryos
00:09:47 1.4 Mammalian eggs
00:10:32 1.5 Invertebrate eggs
00:10:47 2 Evolution and structure
00:12:00 3 Scientific classifications
00:12:22 3.1 Egg size and yolk
00:12:53 3.1.1 Microlecithal
00:14:21 3.1.2 Mesolecithal
00:15:16 3.1.3 Macrolecithal
00:16:52 3.2 Egg-laying reproduction
00:19:29 4 Human use
00:19:38 4.1 Food
00:20:06 4.1.1 Eggs and Kashrut
00:20:44 4.2 Vaccine manufacture
00:21:22 4.3 Culture
00:22:58 5 Collecting
00:24:05 6 Gallery



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SUMMARY
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The egg is the organic vessel containing the zygote in which an animal embryo develops until it can survive on its own; at which point the animal hatches. An egg results from fertilization of an ovum. Most arthropods, vertebrates, and mollusks lay eggs, although some, such as scorpions and most mammals, do not.
Reptile eggs, bird eggs, and monotreme eggs are laid out of water, and are surrounded by a protective shell, either flexible or inflexible. Eggs laid on land or in nests are usually kept within a warm and favorable temperature range while the embryo grows. When the embryo is adequately developed it hatches, i.e. breaks out of the egg's shell. Some embryos have a temporary egg tooth they use to crack, pip, or break the eggshell or covering.
The largest recorded egg is from a whale shark,  and was 30 cm × 14 cm × 9 cm (11.8 in × 5.5 in × 3.5 in) in size. Whale shark eggs typically hatch within the mother.  At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, though the extinct elephant bird and some dinosaurs laid larger eggs. The bee hummingbird produces the smallest known bird egg, which weighs half of a gram (around 0.02 oz). Some eggs laid by reptiles and most fish, amphibians, insects and other invertebrates can be even smaller.
Reproductive structures similar to the egg in other kingdoms are termed "spores," or in spermatophytes "seeds," or in gametophytes "egg cells".