Elephant, Rhino, or a Hippo
Puzzle 4 of Celtic Mythology Hard Pack
Question is: Elephant, Rhino, or a Hippo
and the answer is: PACHYDERM
Word Meaning:
PACHYDERM — (obsolete, zoology) A member of the obsolete taxonomic order Pachydermata, grouping of thick-skinned, hoofed animals such as the rhinoceros, hippopotamus, elephant and tapir.
Definitions from Wiktionary.