1

public class Birb : MonoBehaviour
{
public static GameObject MakeBirbCopy( GameObject original )
{
Birb newBirb = Instantiate(original).GetComponent();
newBirb.m_canExecuteAirSpecial = false;
return newBirb.gameObject;
}
}

public class Example: MonoBehaviour
{

}

How do I get Make BirbCopy reference from Birb class to Example class?

2

Not exactly sure what you meant, but here:

public class Example: MonoBehaviour
{
	public void RandomFunctionName()
	{
		Birb birbOriginal = Object.FindObjectOfType<Birb>();
		Birb birbClone = Birb.MakeBirbCopy(original);
	}

	//Or you could do this, if you assign this value in the editor with a prefab or instance
	public Birb birbPrefab;
	
	public void RandomFunctionNameAgain()
	{
		Birb birbClone = Birb.MakeBirbCopy(birbPrefab);
	}
}
3

Something like this?

public class Birb : MonoBehaviour
     {
      public static GameObject MakeBirbCopy( GameObject original )
         {
             Birb newBirb = Instantiate(original).GetComponent<Birb>();
             newBirb.m_canExecuteAirSpecial = false;
             return newBirb.gameObject;
         }
     }
     
     public class Example: MonoBehaviour
     {
             Birb birb = GameObject.Find("Object_with_birb_script").GetComponent<Birb>();
             birb.MakeBirbCopy(someGameObject);
     }