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* Females in some species can retain sperm in their uterus.
 
* Females in some species can retain sperm in their uterus.
 
* Can successfully fertilize two or more clutches, often several years after copulation.
 
* Can successfully fertilize two or more clutches, often several years after copulation.
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=== The Egg ===
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All chelonians are oviparous.
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==== Temperate Species ====
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* Lay eggs with soft, flexible, leathery shells.
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* Can absorb and lose moisture.
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* Develop more rapidly.
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** Incubation ~2 months.
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==== Tropical Species and Land Tortoises ====
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* Lay eggs with a hard, brittle shell.
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* Prevents eater loss.
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* Develop less rapidly.
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** Incubation ~8-9 months.
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* Egg hatching depends on climate conditions such as spring warmth and seasonal rains.
    
== Copulation ==
 
== Copulation ==
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