English: Life restoration of Tiktaalik roseae, a transitional fossil ("missing link") between sarcopterygian fishes and tetrapods from the late Devonian period of North America. New research has provided the first detailed look at the internal head skeleton of Tiktaalik roseae , the 375-million-year-old fossil animal that represents an important intermediate step in the evolutionary transition from fish to animals that walked on land. This is an artist's conception of the species. The image has frequently been used in Internet meme templates.[1]