THE LIZARD.
This, when fighting with serpents eats the sow-thistle and is free.
THE SWALLOW.
This [bird] gives sight to its blind young ones, with the juice of the celandine.
THE WEASEL.
This, when chasing rats first eats of rue.
THE WILD BOAR.
This beast cures its sickness by eating of ivy.
THE SNAKE.
This creature when it wants to renew itself casts its old skin, beginning with the head, and changing in one day and one night.
THE PANTHER.
This beast after its bowels have fallen out will still fight with the dogs and hunters.
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.