Awww.

I'm sure you don't care, but hippos are not particularly closely related to rhinos -- they're from different orders.

Rhinos are odd-toed ungulates and hippos are even-toed!

I do care. Is this correct?

Both hippos and rhinos are pachyderms. 

Outside strict biological classification, the term "pachyderm" is commonly used to describe elephants, rhinoceroses, and hippopotamuses.

Cuvier's Pachydermata included the three families of mammals he called Proboscidiana, Pachydermata Ordinaria, and Solipedes, all herbivorous. They are now divided into the Proboscidea, represented among living species only by three species of elephants; the Perissodactyla, or odd-toed ungulates, including horses, tapirs and rhinoceroses; the Suina, or pigs and peccaries; the Hippopotamidae; and the Hyracoidea, or hyraxes.

Although the former order of Pachydermata is often described as an artificial grouping of unrelated mammals, it was recognised by notable zoologists, including Charles Darwin, as a grade of hoofed mammals to the exception of other ungulates; and anatomical characters support the affinities of "pachyderm" mammals to each other and to other ungulates.

Source: http://en.wikipedia.org/wiki/Pachydermata

So maybe I should call my stash Pachyderms?

"Pachyderms" sounds good for a stash that has posts about all of those large, thick-skinned mammals in it, sure!

Cool, changed: http://pandawhale.com/ifindkarma/pachyderms