I'm damned if I know what kind of mongoose Riki-tiki-tavi was supposed to be. I don't think they ever actually tell you in the story. :/

Cusimanse (
Crossarchus obscurus)
The cusimanse is a very small, diurnal mongoose from west Africa, and they wander through their territories constantly, sometimes taking shelter under fallen logs, or digging their own burrows. They live in groups of 10-24 members, usually compromised of small family units. It's name is also spelled with a K.
I have also added some new information to the marsh mongoose, yellow mongoose, and slender mongoose entries, so be sure to look at those again as well.