1: 1. Mice - Just 19-21 days! 2. Hamsters - Only 16 days!

2: 3. Rabbits - Around 30 days. 4. Rats - Approximately 21 days.

3: 5. Dogs - About 63 days. 6. Cats - Around 65 days.

4: 7. Guinea Pigs - Only 59-72 days!

5: 8. Horses - Approximately 320 days. 9. Elephants - A lengthy 22 months.

6: 10. Humans - A standard 280 days. 11. Cows - Around 280 days as well.

7: 12. Pigs - About 114 days. 13. Dolphins - A quick 11-12 months.

8: 14. Seals - A brief 9 months. 15. Giraffes - A long 15 months.

9: 16. Armadillos - Just 60-120 days! 17. Opossums - A short 12-13 days.