In some animals

the organs of sense are plainly discernible; and
this is especially the case with the eyes. For animals have a
special locality for the eyes, and also a special locality for
hearing: that is to say, some animals have ears, while others have the
passage for sound discernible. It is the same with the sense of smell;
that is to say, some animals have nostrils, and others have only the
passages for smell, such as birds. It is the same also with the
organ of taste, the tongue. Of aquatic red-blooded animals, fishes
possess the organ of taste, namely the tongue, but it is in an
imperfect and amorphous form, in other words it is osseous and
undetached. In some fish the palate is fleshy, as in the fresh-water
carp, so that by an inattentive observer it might be mistaken for a
tongue.