Skull of a cave bear with a Paleolithic flint axe embedded in its parietal bone found in a cavern near Trieste, Italy, date unknown. The bear survived the wound and probably lived for many years after the encounter. [3650×3051]

Skull of a cave bear with a Paleolithic flint axe embedded in its parietal bone found in a cavern near … More

Tiktaalik, a lobe-finned fish from the late Devonian period, discovered in 2004 in Nunavut, Canada. Tiktaalik is significant in that its fins display some of the earliest examples of basic wrist bone structure and rays which may represent an early form of digits. [3,171 × 1,494]

Tiktaalik, a lobe-finned fish from the late Devonian period, discovered in 2004 in Nunavut, Canada. Tiktaalik is significant in that … More