The researchers studied how long sperm stays in different parts of a hamster's reproductive system. They tied off the beginning of the tubes where sperm travel and checked sperm levels over time. They found that sperm stayed in the tubes for over 78 days, with most sperm becoming immobile after about 24 days. Sperm numbers decreased by half in some areas within 3 days. This information is important for understanding how sperm moves and is stored in the reproductive system.