Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ("identical"), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ("fraternal"), meaning that they develop from two different eggs. In fraternal twins, each twin is fertilized by its own sperm cell.
== Quotes ==
If you’ve ever sat in a room with twins, immediately you’re forced to deal with this confusion. You’re afraid to call them by name because you’re afraid you’re going to get it wrong. At first being a twin is a source of power, you can switch, you can fool people—but then it becomes a vulnerability because people confuse you when you don’t want them to. The famous story of the twins who were both spanked when either one of them did something wrong because the parents wanted to make sure they got the right twin. So that would immediately make each twin totally responsible for the other one’s actions and therefore would make you want to control the other twin’s actions. It gets quite twisted and the confusion of identities becomes quite intense.
David Cronenberg Τοίω τὼ χείρεσσιν ὑπ' Αἰνείαο δαμέντεκαππεσέτην, ἐλάτῃσιν ἐοικότες ὑψηλῇσι.
So here the twins were laid low at Aeneas' hands,down they crashed like lofty pine trees axed.
Homer, Iliad (c. 750 BC), Book V. 559–560 (tr. Robert Fagles).
More tears. Disgraceful. I was getting just like Kester, weeping at the drop of a hat, but of course I was Kester. I'd become him, and now there was just this other stranger who wrote me debonair notes and who sounded just like me.
Susan Howatch, The Wheel of Fortune
For one of us was born a twin And not a soul knew which.
Henry Sambrooke Leigh (1837-1883), The Twins.
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