Communication and Perception
The familiar "quack" of ducks is from the female mallard--it is called the "decrescendo call", and can be heard for miles. A female will give the call when she wants to bring other ducks to her, such as her ducklings, and as a result it is also known as the "hail call". Mallards also use a variety of other calls to communicate amongst themselves. They have a good sense of vision.
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