Triops are crustaceans that look like miniature horseshoe crabs. Triops have a relatively short lifespan of 20 to 90 days and grow quickly to their adult length of one to three inches. How large they grow depends on the amount of light and food they receive. After hatching, they often double in size daily! Each of these packs includes 30-50 cultured Triops eggs, a Triops food packet, a sealed nutrient pack and a direction pamphlet.