The animal known to have the longest pregnancy is the frilled shark , with a gestation that may last up to about 3.5 years (around 42 months), based on observations and estimates from marine biologists.

Among mammals, the record-holder is the elephant : African and Asian elephants are pregnant for about 18–22 months.

Quick Scoop: What animal has the longest pregnancy?

  • The frilled shark appears to top the charts, with a pregnancy estimated at up to 3.5 years.
  • Elephants have the longest confirmed mammal pregnancy, about 22 months.
  • Several other large animals (like some whales and walruses) also stay pregnant for more than a year.

So if you’re picturing “the most epic animal pregnancy,” it’s likely a deep- sea frilled shark quietly carrying embryos for multiple years, while elephants hold the land-mammal crown with their nearly two‑year gestation.

Information gathered from public forums or data available on the internet and portrayed here.