But in these cases the term 'voice' is inappropriate; the more
correct expression would be 'sound'. For the scallop, when it goes
along supporting itself on the water, which is technically called
'flying', makes a whizzing sound; and so does the sea-swallow or
flying-fish: for this fish flies in the air, clean out of the water,
being furnished with fins broad and long. Just then as in the flight
of birds the sound made by their wings is obviously not voice, so is
it in the case of all these other creatures.
The dolphin, when taken out of the water, gives a squeak and moans
in the air, but these noises do not resemble those above mentioned.
For this creature has a voice (and can therefore utter vocal or
vowel sounds), for it is furnished with a lung and a windpipe; but its
tongue is not loose, nor has it lips, so as to give utterance to an
articulate sound (or a sound of vowel and consonant in combination.)
Of animals which are furnished with tongue and lung, the oviparous
quadrupeds produce a voice, but a feeble one; in some cases, a
shrill piping sound, like the serpent; in others, a thin faint cry; in
others, a low hiss, like the tortoise.
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