2014 Prehistoric Creatures: Tiktaalik - 25-Cent Coloured Glow-in-the-Dark Coin

In 2004, researchers working in Nunavut uncovered the fossilized remains of a mysterious prehistoric creature tobridge the evolutionary gap between water and land.

Tiktaalik lived roughly 375 million years ago. It had the gills, scales and finsof a fish, but the head of an amphibian: flat withboth eyes on top, and spiracles that suggest the presence of rudimentary lungs.

What's more, Tiktaalik had extra-thick ribs, another adaptation for animals that don't float in water and need extra support against gravity while on land. It also had wrist and finger-like bone structures inside its fins—precursors to actual limbs.