Most scholars consider modern human maturation to take the longest: sexual maturation is typically twelve to fourtee, and young don’t typically live on their own until eighteen years or later. Elephants can also take up to twenty years to fully mature, though from what I can find this is only in captivity, and sperm whales also have comparable maturation periods.
Actually, sea turtles and Galapagos turtles reach maturity even later, the Galapagos turtles reaching sexual maturity at the age of 40, sea turtles vary with loggerheads reaching it at 12-30 years, green turtles reaching it at 20-50 and hawkbills only taking 3 years.
Good point. I think we were looking at different sets of statistics: I was mainly focusing on when an animal is old enough to live on its own. For most large turtles, I believe that happens even before hatching.
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