How well do swans hear?
A very useful entry on hearing can be found in "The Birdwatcher's
Companion," Christopher Leahy editor. It states that generally the hearing
frequency range of individual species of birds is considerably less than
that of humans, and understandably matches the range of the sounds they
make. Native North American swans are vocal and quite loud so we can assume
they hear well and at considerable distance within that range. Other species
of birds hear in other ranges, and the TOTAL frequency range ALL species of
birds hear is greater than that of humans. The European mute swan common in
urban ponds, despite its name, does make a variety of sounds.
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Update: June 2012