Tiktaalik roseae, better known as the "fishapod," is a 375 million year old fossil fish which was discovered in the Canadian Arctic in 2004 by scientists from
Discovery of "Tiktaalik" shed light on a pivotal point in the history
of life on Earth: when the very first fish ventured out onto land. Columbia University
More about the Tiktaalik discovery can be found at Wikipedia and the University of Chicago website.