One script, different variable for each object.

Hello, I'm trying to make script for birds and I want each bird to fly in random direction, but they all fly in the same direction. Here is the script:

     string direction;
 
         void Awake () {
     
             if (Random.Range(1,2) == 1)
             {
                 direction = "up";
             }
             else 
             {
                 direction = "down";
             }
         }