Description From the top to the bottom: Livyatan melvillei,the largest whale-predators to have ever existed. Albicetus oxymycterus,which was originally classified as a species of the extinct walrus 'Ontocetus oxymycterus'. Brygmophyseter shigensis,a.k.a biting sperm whale,that used to be classified into the genus 'Naganocetus '. These are not based on real size.