| 11. | Smaller species normally have a shorter gestation period than larger animals.
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| 12. | Sexual differentiation begins during gestation, when the gonads are formed.
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| 13. | The gestation period is thought to be twelve to thirteen months.
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| 14. | Their gestation period is 111 days, longer than most rodents.
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| 15. | Gestation requires 14 to 16 months, producing a single calf.
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| 16. | Gestation lasts from 9 to 15 months, depending on species.
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| 17. | Gestation lasts 130 days and births are of a single offspring.
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| 18. | Gestation period lasts 257 270 days ( about 9 months ).
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| 19. | Foals are born after a gestation period of approximately 11 months.
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| 20. | Gestation is typically 140 days, and births are normally twins.
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