Everything you need to understand or teach Professor Gottesman and the Indian Rhinoceros by Peter S. Beagle.
In his introduction to Immortal Unicorn: Volume One, Beagle cites a passage from the Renaissance explorer Marco Polo that likely inspired "Professor Gottesman and the Indian Rhinoceros": .. . and great numbers of unicorns, hardly smaller than an elephant in size. Their hair is like that of a buffalo, and their feet like those of an elephant. In the middle of their forehead is a very large black horn. Their head is like that of...