60 Stupidly Simple Facts That Will Blow Your Mind By Thought Catalog 8. Otters have skin pockets for their favorite rocks. 9. Chocolate was once used as currency (by the Aztecs). 10. Male seahorses carry the baby in their tummy instead of the mommy. 11. Some frogs will glow when they eat fireflies. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16