Elephant Herds post their own sentries. When danger threatens, the sentry raises its trunk and though it may be as far as a half-mile away, the rest of the herd is instantly alerted. How this communication takes place is not understood.

Wolves live and hunt in packs. They are known to roam large distances, perhaps 20 km in a single day. Wolf packs in the far north often travel hundreds of km each year and this is due to them following migrating herds.