Written by: Dr. Jacquie Jacob, University of Kentucky

Ducks have many of the same basic external parts as other fowl, such as chickens. However, some unique characteristics exist in the external anatomies of ducks. For example, a duck’s head (shown in Figure 1) differs from a chicken’s head in several ways. Ducks have no comb and, other than the crested duck, no head covering other than feathers. The bill of a duck is flatter than the beak of a chicken and has a protrusion on the upper tip known as the bean. A duck has webbed toes, which are important for swimming. For all breeds except the Muscovy, male ducks have curled feathers at the base of the tail (called sex feathers), whereas females do not (see Figure 2). 

Diagram of duck head
Figure 1. Parts of a duck’s head (Image from University of Illinois, Used with permission)
Pair of mallard ducks
Figure 2. Comparison of male and female ducks, showing the location of the male sex feather (Image created by Dr. Jacquie Jacob, University of Kentucky from original photo by Janfe on Shutterstock.com)