When geese fly in formation, they create their own unique form of teamwork. As each bird flaps its wings, it creates uplift for the bird immediately following. By flying in their ‘V', the whole flock adds at least 71% more flying range than if each bird flew on its own. Geese honk from behind to encourage those up front to keep up their speed.
When a goose falls out of formation, it suddenly feels the drag and resistance of trying to go it alone and quickly gets back into formation to take advantage of the lifting power of the bird in front. When the lead goose gets tired, it rotates back in the ‘V', and another goose flies point.
When a goose gets sick, or is wounded and falls out of formation, two other geese fall out with their companion and follow it down to lend help and protection. They stay with the fallen goose until it is able to fly, or until it dies, and only then do they launch out on their own, or with another formation to catch up with the group.