A male Mute Swan, note the black knob on its bill.
A male swan [1]. In the Whistling Swan and Mute Swan, the male stands guard while the female incubates the eggs [1]. Male Mute Swans may arches secondary feathers [1]. Males tend to be larger than females [1] [note A]. Mute Swan cobs tend to have a larger knob on the bill [2].
References
^A Listed under Mute Swan, Trumpeter Swan and Whistling Swan pp. 237-8.
- ^ a b c d Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc. ISBN 0394466519.
- ^ 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
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