During the day, hippos live in groups of related females and their young, overseen by an unrelated bull. Hippo pods are extremely fluid – new members come and go all the time. Hippos are territorial in the water but only during the day. At night, they wander to look for food on land and are not territorial.
It is rare for predators to prey on hippos – most hippos die of natural causes or are killed by other hippos in fights. Crocs have been known to take young hippos if they become isolated from the pod, and lions will occasionally kill adults if they can snatch them while they’re out of the water.