Some comparisons. Elephants have pregnancies lasting 18-22 months, sperm whales 14-16 months, alpine salamanders have pregnancies lasting 2 to 4 years, and frilled sharks have gestation periods up to 3.5 years. All 4 give birth to live young, though frilled sharks are ovoviviparous so they develop in eggs but the eggs stay within the womb before they're "birthed" live.
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