What is "zabu"

Zabu is a fictional character in the Marvel Universe who is connected primarily to the Savage Land, and the X-Men, and most recently the Avengers (by way of the " Pet Avengers"). He is the last known living Smilodon and is a companion and ally of Ka-Zar.

An earlier version was known simply as Zar, in the pulp version of Ka-Zar the Savage, featured in Ka-Zar magazine.