Fish eating the dead skin off a hippo is a common example of mutualism—a relationship where both animals benefit. Hippos spend a lot of time in rivers and lakes, and their thick skin sheds dead cells and attracts parasites. Fish like cichlids or cleaner fish take advantage of this by nibbling off the dead skin, algae, and parasites. This helps the fish get an easy meal, and the hippo gets a natural cleaning service, keeping its skin healthier. Video credit goes to @sanantoniozoo Feel free to exp