Meet the largest family of living sharks—deep-sea catsharks. Deep-sea catsharks are the largest family of living sharks today, with more than 90 species. Catsharks were named for their long, cat-like eyes that are specialized for seeing in low light conditions. These a-meow-zing sharks can be found up to 2,200 meters (7,200 feet) below the surface and grow up to 75 centimeters (30 inches). Most catsharks lay elaborate clusters of egg cases. The eggs can take up to two years to develop. Tough egg