Communication in bottlenose dolphins appears to be extensive and complex. A dolphin maintains an intricate social network that includes a few close associates (such as mothers and calves or pair-bonded males), plus more casual relationships with others who come and go within a larger group. Dolphins hunt together to find food. Pods of dolphins coordinate their movements to herd prey, and then take turns swimming into the middle of the assembled fish to eat. There is still much to learn about how dolphins communicate though a number of generalities have emerged from research.