Longest Gestation

In humans, the period of time it takes for a baby to grow in the womb to the point when it's ready to be born is called the gestation period and it averages about 40 weeks or nine months. Relative to many animals, that is a short period of time

When it comes to mammals, no one has to wait as long to give birth as the elephant. weighs approximately 230 pounds when born, to develop. The average gestation period for an elephant is about  95 weeks or 23 months.

Black alpine salamanders have gestation periods that can last two to three years. The higher they live in the Alps, the colder it is and the longer their gestation period lasts.

Certain species of sharks also have long gestation periods, such as a basking shark carries its young almost three years, while the frilled shark has a gestation period of three and a half years.

Deeper beneath the sea is another marine animal the a deep-sea octopus at over 4,500 feet deep in the ocean waters off California. Babies were born after a gestation period of 53 months. That is more than twice as long as most that live in more shallow waters.