Geese have many of the same basic external parts as ducks and other fowl, such as chickens. Figure 1 illustrates the external parts of a goose's body. Some breeds of geese have features that others do not. For example, as shown in Figure 2, some breeds have a horny knob at the base of the bill and/or a dewlap, which is a loose growth of skin extending from the base of the lower bill to the upper throat.
Fig. 1. Parts of a male Toulouse goose. Source: John Anderson, The Ohio State University.
Fig. 2. Parts of the head of a male African goose. Source: John Anderson, The Ohio State University.