Animal Facts fact-of-the-day newsletter

October 01, 2026 Fact of the Day Across Species Colossal squid have the biggest eyes in the animal kingdom. By Michael Nordine They don’t call them colossal for nothing. Though they aren’t the largest animal in the world, colossal squid do have the biggest eyes in the animal kingdom. They tend to measure between 11 and 12 inches in diameter, roughly the size of a soccer ball or large dinner plate. In addition to helping them hunt in the dark waters they call home, colossal squids’ massive eyes are equally useful when spotting predators, especially sperm whales. Their eyes face forward, giving them stereoscopic vision, and they contain light organs that allow them to see in the dark and judge distances — both between its predators and its prey. So what ARE the largest animals in the world? Today's Question What animal holds the title of world’s largest land predator? Polar Bear White Rhinoceros Hippopotamus Saltwater Crocodile Keep Exploring Across Species How Big Is the Giant Squid? Mammals Why Do Cats Have Slit Pupils? Across Species 6 Reasons To Love Cephalopods Was this email forwarded to you? Sign Up Advertise Contact Us Privacy Policy Terms of Use 325 North LaSalle Street, Suite 200, Chicago, IL 60654 If you'd like to unsubscribe from all Animal Facts emails, click here.