From the Back of the book: "Creatures" details the significant beasts and monsters of Tolkien's world - the kelvar, living things that move, born of the Great Song, such as ravens, ulmodili (dolphins), mearas (descendants of Orome's steed), oliphaunts, great eagles, crebain, the Kirinkir of fallen Númenor, and black swans; as well as the twisted things "of horn and ivory" that "dye the earth with blood" at Morgoth's behest.