Here’s a reminder that The History Channel is airing the second episode of their excellent series on the process of evolution tonight, a show titled “Guts.” It’s followed by a rerun of the first episode, “Eyes.”

10:00 PM Evolve: Guts
It doesn’t just take willpower to survive. It takes guts—in the form of a digestive system that turns food into fuel. Look closely at the role guts have played in shaping some of Earth’s most successful animals: tyrannosaurs, snakes, cows, humans and others. Take a 575-million year journey that begins with the planet’s first multi-cellular organisms and ends at our dinner tables. Watch as live-action natural history sequences, CGI, epic docudrama, and experimental science help to illustrate our and our fellow species’ eternal struggle for survival on earth.

11:00 PM Evolve: Eyes
They are one of evolution’s most useful and prevalent inventions. Ninety five percent of living species are equipped with eyes and they exist in many different forms. Learn how the ancestors of jellyfish may have been the first to evolve light-sensitive cells. Discover how dinosaur’s evolved eyes that helped them become successful hunters. Finally, learn how primates evolved unique adaptations to their eyes that allowed them to better exploit their new habitat, and how the ability to see colors helped them find food.