Phaedimus
Moreover, the tunny is so sensible of the equinoxes and solstices, that he teaches even men themselves without the help of any astrological table. For where the winter solstice overtakes him, there he remains till the vernal equinox.
As for that same artifice of the cranes, that keep themselves waking by clutching a stone in their claws, how much more cunningly done is that of the dolphin, for whom it is not lawful to stand still or to be out of motion. For it is the nature of the dolphins to be always in motion; so that, when they cease to move, they also cease to live. And therefore when sleep seizes them, they raise their bodies to the superficies of the sea, and so sinking down again with their bellies upward, are carried along with the tide till they touch again the shore. Wakened in that manner, with an impetuous noise they mount upward again, designing thus a kind of rest still intermixed with motion. And the same thing is reported of the tunnies for the same reason.
