1) Family eschrichtiidae 2) Mammal family 
Eschrichtiidae or the gray whales is a family of baleen whale (suborder Mysticeti) with a single extant species, the gray whale (Eschrichtius robustus). The family, however, also includes three described fossil genera: Archaeschrichtius and Eschrichtioides from the Miocene and Pliocene of Italy respectively, and Gricetoides from the Pliocene of No...
[n] - comprising only the gray whales
family Eschrichtiidae noun comprising only the grey whales