Wild animals have more dense flesh and less connective tissue than domesticated animals.  They also store more of a form of starch in their muscles called glycogen.  This is because wild animals exercise more and need this stored energy to evade predators and danger.

The amount of glycogen in the muscles is important  as it is needed for the production of acid during aging which assists in relaxing the muscle when it is in rigor mortis.  The bottom line is that wild animals exercise more and are therefore tougher, plus they have more glycogen. 

However if the animal is chased during the harvesting process the levels of glycogen levels are greatly reduced which gives the meat a different texture and flavor, because the acids developed from the glycogen contribute to both.

Game should be hung in a cool and dry place with plenty of air circulation and protected from rodents and insects.