If you’re a person with testicles, hang on to ’em. :D
Of the beaver There is an animal called the beaver, which is extremely gentle; its testicles are highly suitable for medicine. Physiologus says of it that, when it knows that a hunter is pursuing it, it bites off its testicles and throws them in the hunter’s face and, taking flight, escapes. But if, once again, another hunter is in pursuit, the beaver rears up and displays its sexual organs. When the hunter sees that it lacks testicles, he leaves it alone. Thus every man who heeds God’s commandment and wishes to live chastely should cut off all his vices and shameless acts, and cast them from him into the face of the devil. Then the devil, seeing that the man has nothing belonging to him, retires in disorder. That man, however, lives in God and is not taken by the devil, who says: ‘I will pursue, I will overtake them…'(Exodus, 15:9) The name castor comes from castrando, ‘castrate’.
Of the animal called the ibex There is an animal called the ibex, which has two horns of such strength that, if it were to fall from a high mountain to the lowest depths, its whole body would be supported by those two horns. The ibex represents those learned men who are accustomed to manage whatever problems they encounter, with the harmony of the two Testaments as if with a sound constitution; and, supported as by two horns, they sustain the good they do with the testimony of readings from the Old and New Testament.