was a fish with sturdy ribs capable of supporting air-breathing and a pelvis more robust than we commonly find in fish. And remarkably, Tiktaalik’s front fin had the same bone structure we see in all four-limbed creatures, including humans: one bone, then two bones, then lots of little bones (including wrist bones), and primitive digit bones. Tiktaalik was a fish with a wrist and neck and could most likely prop itself up on its fins and walk in shallow water, but it is unlikely Tiktaalik walked on