Bird Balance

The center of gravity is commonly explained as, "The point of which all the mass of an object appears to be concentrated." In this example there are two weights located in the tips of the birds wings. Those weights in comparison to the rest of the birds body creates a "concentrated mass" for the object. The center of gravity lies in the mid-point of the area in between them. Which, in this case, lies in the birds beak. Without the weights, the center of gravity is located more behind the beak and is located towards the center of the birds body. This is because there is no longer concentrated mass in the object.