De sollertia animalium

Then again we have heard Aristotimus relating how the land hedge-hog had a perception of the rising of the wind, and praising the trigonal flight of cranes. But for my part, I produce no particular hedge-hog of Cyzicus or Byzantium, but all the sea hedge-hogs in general; who, when they perceive a storm coming, ballast themselves with little stones, lest they should be overturned by reason of their lightness or carried away by the rolling of the waves, which they prevent by the weight of their little stones.

On the other side, the cranes’ order in their flight against the wind is not of one sort. But this is a general notion among all fish, that they always swim against the waves and the tide, and always take care lest the wind being in their tails should force their fins from their backs, and leave their naked bodies exposed to the cold and other inconveniences; and therefore they still oppose the prows of their bodies against the waves. For that while they thus cleave the waves at the top, the sea keeps their fins close, and lightly flowing over the superficies of their bodies, becomes less burdensome, besides that it suffers not their scales to rise.

This, I say, is common to all fish, except that fish which is called ellops; which, as they report, always swims with the wind and tide, not minding the erection or opening of the scales, which do not lie towards the tail, as in other fish.

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

Having thus concluded their mathematical foreknowledge of the mutations of the sun, of which Aristotle gives testimony, let me now relate their skill in arithmetic; but first of all, their knowledge in optics, of which Aeschylus seems not to have been altogether ignorant. For these are his words:

Casting a squint-eye like the tunny.

But wanting arithmetic in order to the preservation of mutual love and society one with another, they arrive in such a manner to the perfection of that science, that, in regard they are extremely desirous to enjoy the society of each other, they always make up their whole fry into the form of a cube, and make a solid of the whole number consisting of six equal planes; and then they swim in such order as to present an equal front in each direction. So then, if the observer of the tunnies does but exactly take the number of the side that he sees, he knows the whole

The fish amiae, which are another sort of tunnies, are so called, because they swim in shoals, as also the pelamydes or summer whitings. As for the rest that are seen to swim in shoals and to observe a mutual society, their number is not to be expressed. And therefore let us proceed to those that observe a kind of private and particular society one with another. Among which is the pinoteras of Chrysippus, upon which he has expended so much ink, that he gives it the precedency in all his books, both physical and ethical. For Chrysippus never knew the spongotera, for he would not have passed it over out of negligence.

The pinoteras is so called, from watching the fish called pina or the nacre, and in shape resembles a crab; and cohabiting with the nacre, he sits like a porter at his shellside, which he lets continually to stand wide open until he spies some small fishes gotten within it, such as they are wont to take for their food. Then entering the shell, he nips the flesh of the nacre, to give him notice to shut his shell; which being done, they feed together within the fortification upon the common prey.

The sponge is governed by a certain little creature more like a spider than a crab. For the sponge wants neither soul nor sense nor blood; but growing to the stones, as many other things do, it has a peculiar motion from itself and to itself, which nevertheless stands in need as it were of a monitor or instructor. For being otherwise of a substance loose and open, and full of holes and hollowness, by reason of the sloth and stupidity of it the sponge-watcher assists to give notice when any thing of food enters the cavities of it, at which time the sponge contracts itself and falls to feeding.

But if a man approach and touch it, being nipped and admonished by the sponge-watcher, it seems to shudder

The purple shellfish also, called porphyrae, clustering together in a kind of mutual society, build up little combs for themselves like bees, wherein they are said to generate; and culling out the choicest substance of the moss and seaweed that stick to their shells, they seem to be in a circular commons among themselves, feeding the one upon the other’s nourishment.