The sea-frogs, they say, are wont to cover themselves with sand, and moving near the water, the fishes strike at them, as at a bait, and are themselves taken and devoured by the frogs.

Between the kite and the crow there is a kind of natural war, and wherever the one finds the eggs of the other, he breaks them.
But who is there who can avoid being struck with wonder at that which has been noticed by Aristotle, who has enriched us with so many valuable remarks?
When the cranes[224] pass the sea in search of warmer climes, they fly in the form of a triangle.

By the first angle they repel the resisting air; on each side, their wings serve as oars to facilitate their flight; and the basis of their triangle is assisted by the wind in their stern.

Those which are behind rest their necks and heads on those which precede; and as the leader has not the same relief, because he has none to lean upon, he at length flies behind that he may also rest, while one of those which have been eased succeeds him, and through the whole flight each regularly takes his turn.
I could produce many instances of this kind; but these may suffice.

Let us now proceed to things more familiar to us.