The animal with the longest pregnancy is the African elephant.
Elephants, being the largest land mammals, unsurprisingly hold the record for the longest gestation period among mammals. Here's a breakdown:
- African Elephants: They are pregnant for an average of 22 months.
- Asian Elephants: Their gestation period ranges from 18 to 22 months.
Therefore, based on the provided information, the African elephant has the longest confirmed average pregnancy length.
