Syrian hamsters typically have the shortest gestation period of just 16 days. For Chinese and Russian Dwarf hamsters, on the other hand, pregnancy could last for about 18 to 21 days.

2. Frilled Shark Gestation Period: Almost 3 Years Several shark species have evolved to give live birth, and the gestation period of some of these can last exceptionally long.

Animals with shorter gestation periods have multiple babies, like your typical house mouse, a breeding machine that’s pregnant for just 19 days—yielding between 12 to 20 babies every two months.