India, Sept. 17 -- When it comes to pregnancy, animals can have wildly different gestation periods. Some give birth within a few weeks, while others carry their young for more than a year. But 486 days is an especially long pregnancy period-and it belongs to one of the world's most fascinating large mammals.

Which Animal Gives Birth After 486 Days?

The surprising answer is the black rhinoceros, particularly the Southern black rhinoceros.

Historical records have reported black rhinoceros gestation lasting between 474 and 486 days, making 486 days one of the longest reported gestation lengths for the species.

That works out to roughly 16 months of pregnancy.

So, while humans typically experience pregnancy for around nine months, a blac...