They secrete an oily red substance that acts as a moisturiser, sunblock and protects them from germs. This also makes them look like they are sweating blood.
Pygmy hippos will spend most of their lives in solitary routines, but common hippos are often found in large groups or bloats. At times, these groups can include up to 100 hippos in total. This allows for safety and security and gives males control over their territory and families.
Though the Greeks called them "river horses" and you will almost always see hippos in the water, they can't actually swim or float. They will spend hours in rivers and lakes, sometimes with only their eyes showing, but they remain in shallow waters. They find sandy river bottoms and banks to stand on.
