15. Pig
This pregnant piggy sure is enjoying her maternity photo shoot! Pigs are known to be quite the eaters and when they’re pregnant, they can eat tons. They usually only show signs of pregnancy around three weeks before they give birth because of their originally hefty sizes (but they can get so big that their bellies hit the ground). The gestation period is around 114 days, and they average around 10 piglets per cycle but can have up to 23!