Man is the only animal for whom his own existence is a problem which he has to solve and from which he cannot escape.

Animals, in their generation, are wiser than the sons of men, but their wisdom is confined to a few particulars, and lies in a very narrow compass.

What delight can there be, and not rather displeasure, in hearing the barking and howling of dogs? Or what greater pleasure is there to be felt when a dog followeth a hare than when a dog followeth a dog?

There be beasts that, at a year old, observe more, and pursue that which is for their good more prudently, than a child can do at ten.

Man is a troublesome animal and therefore is not very manageable.

Man, when perfected, is the best of animals, but when separated from law and justice, he is the worst of all. 

Do you not see how God is praised by those in the heavens and those on earth? The very birds praised Him as they wing their way.

Be a good animal, true to your animal instincts.

Man and animals are really the conduit of food, the sepulcher of animals, and resting place of the dead, one causing the death of the other, making themselves the covering for the corruption of other dead bodies.

An ape will be an ape, though clad in purple.

How like to us is that filthy beast the ape.

Imitate the ass in his love to his master.

It is remarkable that only small birds properly sing.