"Wolves"

Wolves always travel in single file

this behavior is known as 'trailblazing'. 

The reason for this is to conserve the energy of the pack

the first wolf in line is known as the 'trailblazer', 

whose job it is to encounter any obstacles in the path and pack down the snow. 

This allows for a smoother, more efficient journey, 

rather than having all the individual wolves plow through the snow separately.
When the 'trailblazer' tires, he or she falls behind 

and another wolf takes over the helm and leads the trail. 

Through intelligence and adaptation the wolf 

has been successful in surviving for hundreds of thousands of years

one main reason is their every effort to conserve energy

as with all successful predators it is a balance of energy out/energy in 

and the main reason that it such a preposterous statement 

by the anti-wolf camp that "wolves run and kill for sport and fun, 

and then do not consume their kill"! 

With only one out of every seven attempts at a hunt being successful

wolves would never waste that kind of VITAL energy. 

I propose that only humans kill for 'fun and recreation.