…The mere idea of permitting the existence of unnecessary suffering, still more that of taking life, was abhorrent to him. Vasari tells, as an instance of his love of animals, how when in Florence he passed places where birds were sold he would frequently take them from their cages with his own hand, and having paid the sellers the price that was asked would let them fly away in the air, thus giving them back their liberty.

That this horror of inflicting pain was such as to lead him to be a vegetarian is to be inferred from a reference which occurs in a letter sent by Andrea Corsali to Giuliano de’Medici, in which, after telling him of an Indian race called Gujerats, who neither eat anything that contains blood nor permit any injury to any living creature, he adds ‘like our Leonardo da Vinci.’