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=== Viviparity ===
 
=== Viviparity ===
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* All Boas, Vipers, Garter Snakes, European Lizard and Slow Worm,some Skinks and Chameleons.
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* Involves placental exchange between the mother and foetus.
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* Corpus luteum is maintained and secretes progesterone, which inhibits oviduct contraction.
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* One clutch a year.
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* Gestation can last 1.5-6 months.
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* Added space of the foetus puts pressure on the gastrointestinal tract.
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** Pregnant females rapidly lose condition.
    
== The Egg ==
 
== The Egg ==
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