Resting at the surface may last for a few moments or for quite long periods of time, even hours. It often seems as if one member of the group will remain more attentive then the rest. Sometimes the young calves have difficulty remaining as still as the adults. After a while the frequency of the short calls increases until finally one whale gives a louder “wake up” call. Then the activity within the group will pick up and the group will travel onwards, rest over.