A sudden cessation of all movement by an individual or group of individuals, holding stock-still, apparently Listening or perhaps feeling distant vibrations. Individuals may begin very slow moving of the head from one side to another - Head-Swinging - presumably to localise sound. When concerned about predators elephants may hold motionless, other than Head-Swinging, for a period of 5-60 seconds, when they are presumably using all of their senses to locate the source of disturbance. Freezing is most often initiated by an older member of the group. Others follow her/his lead, even if she or he might be bringing up the rear of the group.
In slo-mo, gf0034 and calves are moving away. gf0034 stops and Freezes momentarily - her Foot-Lifted, Ears-Stiff and Head-Swinging. Her calves continue walking. (Gorongosa, Mozambique)
