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Female of Mute Swan with youngs

A pen with cygnets.

A female swan [1]. In the Whistling Swan and Mute Swan, the male stands guard while the female incubates the eggs [1]. Males tend to be larger than females [1] [note A]. Mute Swan cobs tend to have a larger knob on the bill than the pens [2].


^A Listed under Mute Swan, Trumpeter Swan and Whistling Swan pp. 237-8.

  1. ^ a b c Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc. ISBN 0394466519. 
  2. ^ Madge, Steve; Burn, Hilary (1988). Waterfowl : an identification guide to the ducks, geese and swans of the world. Roger Tory Peterson (foreword). New York, NY: Houghton Mifflin. ISBN 0395467276.  Cite uses deprecated parameter |coauthors= (help)

Anatomy of an amiotic egg This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.