void OnTriggerStay2D(Collider2D other)
{
if (other != null)
{
Cow t = other.gameObject.GetComponent <Cow> ();
if (t.CompareTag("PickUp") && cowCount == t.cowCount && Input.GetMouseButtonUp(0))
{
Destroy(other.gameObject);
var newCow = Instantiate(nextCow, transform.position, transform.rotation);
newCow.transform.parent = GameObject.Find("Cows").transform;
Destroy(gameObject);
cowCount *= 2;
}
}
}