Word Origin and History for semi-Expand before vowels sem-, word-forming element meaning half, part, partly; partial, imperfect; twice, from Latin semi-half, from PIE *semi-half (cf. Sanskrit sami half, Greek hemi-half, Old English sam-, Gothic sami-half).
Well-known rodents include mice, rats, squirrels, prairie dogs, porcupines, beavers, guinea pigs, hamsters, gerbils and capybaras. Other animals such as rabbits, hares, and pikas, whose incisors also grow continually, were once included with them, but are now considered to be in a separate order, the Lagomorpha.
Report Abuse. No, the families they belong to are Rhinos-Rhinocerotidae Hippos-Hippopotamidae Pigs-Suidae Horses-Equidae Family is a particular term used in biological classification. What you may be thinking of is that they are all ungulates (Ungulata-which is a Superorder) - hooved animals.hinos belong to one family, the Rhinocerotidae. There are only five species in the family. They are more closely related to horses than hippos. They belong to the order Perissodactyla (odd-toed ungulates) which includes all the horses and tapirs.